Exhibit 10.4

SECOND AMENDMENT TO THE CREDIT AGREEMENT

THIS SECOND AMENDMENT, dated as of February 14, 2007
(the Second Amendment), to the Credit Agreement, dated as of September 30, 2005, as amended by the First Amendment thereto, dated as of November 1, 2006 (the Credit Agreement), among CONCENTRA INC., a
Delaware corporation (Holdings), CONCENTRA OPERATING CORPORATION, a Nevada corporation (the Borrower), the several banks and other financial institutions from time to time parties thereto (the
Lenders) and JPMORGAN CHASE BANK, N.A., a national banking association, as administrative agent for the Lenders thereunder (in such capacity, the Administrative Agent), is entered into by and among Holdings, the
Borrower, the Lenders and the Administrative Agent.

W I T N E S S E T
H:

WHEREAS, Holdings, the Borrower, the Lenders and the Administrative Agent are parties to the Credit Agreement;

WHEREAS, the Borrower has requested that the Lenders amend the Credit Agreement, as more fully described herein; and

WHEREAS, the Lenders are willing to agree to such amendment, but only upon the terms and subject to the conditions set
forth herein.

NOW THEREFORE, in consideration of the premises and the mutual covenants hereinafter set forth, the parties
hereto hereby agree as follows:

1. Defined Terms. Unless otherwise defined herein, capitalized terms which are
defined in the Credit Agreement are used herein as therein defined.

2. Amendment to Section 1.1 (Definitions).
Section 1.1 of the Credit Agreement is hereby amended by replacing clause (e) in the definition of Consolidated EBITDA with the following:

(e) any extraordinary, unusual or non-recurring non-cash (or, in the case of clause (ii) below, cash) expenses or losses (including, whether or not otherwise includable as a separate item in the statement
of such Consolidated Net Income for such period, (i) non-cash losses on sales of assets outside of the ordinary course of business and (ii) cash losses in an aggregate amount up to $12,250,000 in connection with the settlement by FOCUS
Healthcare Management, Inc., a Wholly Owned Subsidiary of the Borrower, of Gunderson, et al. v. F.A. Richard & Associates, a class action lawsuit in Louisiana, in January 2007),

3. Amendment to Section 7.5 (Disposition of Property). Section 7.5 of the Credit Agreement is hereby amended by
(i) deleting the word and at the end of clause (f) thereof, (ii) replacing the . at the end of clause (g) with a ; and and (iii) adding the following:



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(h) the Disposition of all or substantially all of the assets (including, without limitation, all
or substantially all of the shares of Capital Stock) of Concentra Integrated Services, Inc., a Massachusetts corporation, MetraComp, Inc., a Connecticut corporation, First Script Network Services, Inc., a Nevada corporation and FOCUS Healthcare
Management, Inc., a Tennessee corporation, each a Wholly Owned Subsidiary of the Borrower, on or before December 31, 2007 (the Workers Compensation Care Management Divestiture); provided that, subject to the right of the Loan
Parties to retain a certain amount of such Net Cash Proceeds as set forth in Section 2.9 of this Agreement, 100% of the Net Cash Proceeds thereof are applied in accordance with Section 2.9 of this Agreement.

4. Amendment to Section 7.6 (Restricted Payments). Section 7.6 of the Credit Agreement is hereby amended by
(i) deleting the word and at the end of clause (d) thereof, (ii) replacing the . at the end of clause (e) with a ; and and (iii) adding the following:

(f) within six months after the Workers Compensation Care Management Divestiture, the Borrower may pay a one time dividend in an aggregate amount
not to exceed $100,000,000 to permit Holdings thereafter to distribute the proceeds thereof as a dividend to its shareholders.

5. Amendment Fee. In consideration of the agreement of the Required Lenders to the amendments contained herein, Holdings and the Borrower agree to pay to each Lender (hereinafter, an Executing Lender) that executes
and delivers this Second Amendment to the Administrative Agent or its counsel by 12:00 noon, New York City time, on February 27, 2007, an amendment fee in an amount equal to five basis points (0.05%) of the aggregate amount of such Executing
Lenders Term Loans, Revolving Extensions of Credit and Available Revolving Commitments outstanding on the Second Amendment Effective Date. The amendment fee shall be payable by the Borrower on the Second Amendment Effective Date in immediately
available funds to the Administrative Agent on behalf of the applicable Executing Lender.

6. Conditions to Effectiveness
of this Second Amendment. This Second Amendment shall become effective upon the date (the Second Amendment Effective Date) when the following conditions are satisfied:

(i) Second Amendment to Credit Agreement. The Administrative Agent shall have received counterparts of this Second Amendment, duly
executed and delivered by Holdings and the Borrower, and executed and delivered or consented to by the Required Lenders;

(ii) Fees. The Administrative Agent shall have received any applicable amendment fee pursuant to Paragraph 5 of this Second Amendment, together with any other fees and expenses required to be paid on or before the Second Amendment
Effective Date for which invoices have been timely presented;



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(iii) No Default. No Default or Event of Default shall have occurred and be
continuing on such date or after giving effect to the transactions contemplated herein; and

(iv) Representations and
Warranties. Each of the representations and warranties made by the Loan Parties in or pursuant to the Loan Documents shall be true and correct in all material respects on and as of the date hereof, before and after giving effect to the
effectiveness of this Second Amendment, as if made on and as of the date hereof, except to the extent such representations and warranties expressly relate to a specific earlier date, in which case such representations and warranties were true and
correct as of such earlier date.

7. Continuing Effect of the Credit Agreement. This Second Amendment shall not
constitute an amendment or waiver of any provision of the Credit Agreement not expressly referred to herein and shall not be construed as an amendment, waiver or consent to any further or future action on the part of the Loan Parties that would
require an amendment, waiver or consent of the Lenders or Administrative Agent. Except as expressly amended hereby, the provisions of the Credit Agreement are and shall remain in full force and effect.

8. Counterparts. This Second Amendment may be executed by one or more of the parties hereto on any number of separate counterparts
(including by facsimile or electronic transmission acceptable to the Administrative Agent), and all of said counterparts taken together shall be deemed to constitute one and the same instrument.

9. Severability. Any provision of this Second Amendment which is prohibited or unenforceable in any jurisdiction shall, as to such
jurisdiction, be ineffective to the extent of such prohibition or unenforceability without invalidating the remaining provisions hereof, and any such prohibition or unenforceability in any jurisdiction shall not invalidate or render unenforceable
such provision in any other jurisdiction.

10. Integration. This Second Amendment and the other Loan Documents
represent the agreement of the Loan Parties, the Administrative Agent and the Lenders with respect to the subject matter hereof, and there are no promises, undertakings, representations or warranties by the Administrative Agent or any Lender
relative to the subject matter hereof not expressly set forth or referred to herein or in the other Loan Documents.

11.
GOVERNING LAW. THIS SECOND AMENDMENT AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES UNDER THIS SECOND AMENDMENT SHALL BE GOVERNED BY, AND CONSTRUED AND INTERPRETED IN ACCORDANCE WITH, THE LAW OF THE STATE OF NEW YORK.

[Signature Pages to Follow]



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IN WITNESS WHEREOF, the parties hereto have caused this Second Amendment to be duly executed and
delivered by their proper and duly authorized officers as of the day and year first above written.



CONCENTRA INC.By:

/s/ Thomas E. KiralyName:

Thomas E. KiralyTitle:

Executive Vice President




CONCENTRA OPERATING CORPORATIONBy:

/s/ Thomas E. KiralyName:

Thomas E. KiralyTitle:

Executive Vice President




JPMORGAN CHASE BANK, N.A., as
Administrative Agent and a LenderBy:

/s/ Stephanie ParkerName:

Stephanie ParkerTitle:

Executive Director


Concentra Operating Corporation Second Amendment Signature Page



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Bushnell CBNA Loan Funding LLC, for itself or as agent for Bushnell CFPI Loan Funding LLC, as a Lender (name of
institution)By:

/s/ Janet HaackName:

Janet HaackTitle:

As Attorney In Fact


Concentra Operating Corporation Second Amendment Signature Page



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Trumbull THC2 LAN Funding LLC, for itself or as agent forTrumbull THC2 CFPI Loan Funding LLC.

,as a LenderBy:

/s/ Janet HaackName:

Janet HaackTitle

As Attorney In Fact




Concentra Operating Corporation Second Amendment Signature Page



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BABSON CLO LTD. 2003-IBABSON CLO LTD. 2004-IBABSON CLO LTD. 2004-IIBABSON CLO LTD. 2005-IBABSON CLO LTD. 2005-IIIBABSON CLO LTD. 2006-IBABSON CLO LTD. 2006-IIBABSON CLO LTD. 2007SAPPHIRE VALLEY CDO I, LTD.

,as LendersBy: Babson Capital Management LLC as Collateral ManagerBy:

/s/ Arthur J. McMahon, Jr.Name:

Arthur J. McMahon, Jr.Title:

DirectorBILL & MELINDA GATESFOUNDATION TRUST

,as a LenderBy: Babson Capital Management LLC as Investment AdviserBy:

/s/ Arthur J. McMahon, Jr.Name:

Arthur J. McMahon, Jr.Title:

DirectorHAKONE FUND LLC

, as a LenderBy: Babson Capital Management LLC as Investment ManagerBy:

/s/ Arthur J. McMahon, Jr.Name:

Arthur J. McMahon, Jr.Title:

DirectorMASSACHUSETTS MUTUAL LIFEINSURANCE COMPANY

, as a LenderBy: Babson Capital Management LLC as Investment AdviserBy:

/s/ Arthur J. McMahon, Jr.Name:

Arthur J. McMahon, Jr.Title:

Director




Concentra Operating Corporation Second Amendment Signature Page



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LONG LANE MASTER TRUST IV

, as a LenderBy:

/s/ Christina L. RamseurName:

Christina L. RamseurTitle:

Authorized Agent




Concentra Operating Corporation Second Amendment Signature Page



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HARBOUR TOWN FUNDING LLC

as a LenderBy:

/s/ Christina L. RamseurName:

Christina L. RamseurTitle:

Assistant Vice President




Concentra Operating Corporation Second Amendment Signature Page



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BALLANTYNE FUNDING LLC

, as a LenderBy:

/s/ Christina L. RamseurName:

Christina L. RamseurTitle:

Assistant Vice President




Concentra Operating Corporation Second Amendment Signature Page



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PPM MONARCH BAY FUNDING LLC

, as a LenderBy:

/s/ Christina L. RamseurName:

Christina L. RamseurTitle:

Assistant Vice President




Concentra Operating Corporation Second Amendment Signature Page



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PPM SHADOW CREEK FUNDING LLC

, as a LenderBy:

/s/ Christina L. RamseurName:

Christina L. RamseurTitle:

Assistant Vice President




Concentra Operating Corporation Second Amendment Signature Page



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Union Square CDO Ltd.By: Blackstone Debt Advisors L.P.As Collateral Manager

, as a Lender(name of institution)By:

/s/ DEAN T. CRIARESName:

DEAN T. CRIARESTitle:

Senior Managing Director




Concentra Operating Corporation Second Amendment Signature Page



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Monument Park CDO Ltd.By: Blackstone Debt Advisors L.P.As Collateral Manager

, as a Lender(name of institution)By:

/s/ DEAN T. CRIARESName:

DEAN T. CRIARESTitle:

Senior Managing Director




Concentra Operating Corporation Second Amendment Signature Page



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Loan Funding VI LLC,For itself or as agent forCorporate Loan Funding VI LLC

, as a Lender(name of institution)By:

/s/ DEAN T. CRIARESName:

DEAN T. CRIARESTitle:

Senior Managing Director




Concentra Operating Corporation Second Amendment Signature Page



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Essex Park CDO Ltd.By: Blackstone Debt Advisors L.P.As Collateral Manager

, as a Lender(name of institution)By:

/s/ DEAN T. CRIARESName:

DEAN T. CRIARESTitle:

Senior Managing Director




Concentra Operating Corporation Second Amendment Signature Page



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Lafayette Square CDO Ltd.By: Blackstone Debt Advisors L.P.As Collateral Manager

, as a Lender(name of institution)By:

/s/ DEAN T. CRIARESName:

DEAN T. CRIARESTitle:

Senior Managing Director




Concentra Operating Corporation Second Amendment Signature Page



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Inwood Park CDO Ltd.By: Blackstone Debt Advisors L.P.As Collateral Manager

, as a Lender(name of institution)By:

/s/ DEAN T. CRIARESName:

DEAN T. CRIARESTitle:

Senior Managing Director




Concentra Operating Corporation Second Amendment Signature Page



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SENIOR DEBT PORTFOLIOBy: Boston Management and Research as Investment Advisor

, as a Lender(name of institution)By:

/s/ Payson F. SwaffieldName:

Payson F. SwaffieldTitle:

Vice President




Concentra Operating Corporation Second Amendment Signature Page



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By: Callidus Debt Partners CLO Fund III Ltd.By: Its Collateral Manager,Callidus Capital Management, LLC

, as a Lender(name of institution)By:

/s/ Peter BennittName:

Peter BennittTitle:

Principal




Concentra Operating Corporation Second Amendment Signature Page



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By: Callidus Debt Partners CLO Fund IV Ltd.By: Its Collateral Manager,Callidus Capital Management, LLC.

, as a Lender(name of institution)By:

/s/ Peter BennittName:

Peter BennittTitle:

Principal




Concentra Operating Corporation Second Amendment Signature Page



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Hanover Square CLO Ltd.By: Blackstone Debt Advisors L.P.As Collateral Manager

, as a Lender(name of institution)By:

/s/ DEAN T. CRIARESName:

DEAN T. CRIARESTitle:

Senior Managing Director


.



Concentra Operating Corporation Second Amendment Signature Page



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Calyon New York Branch, as a LenderBy:

/s/ Thomas RandolphName:

Thomas RandolphTitle:

Managing DirectorBy:

/s/ Priya VratName:

Priya VratTitle:

Vice President




Concentra Operating Corporation Second Amendment Signature Page



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Carlyle High Yield Partners VIII, Ltd

, as a Lender(name of institution)By:

/s/ Linda PaceName:

Linda PaceTitle:

Managing Director




Concentra Operating Corporation Second Amendment Signature Page



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Carlyle Loan Investments, Ltd.

, as a Lender(name of institution)By:

/s/ Linda PaceName:

Linda PaceTitle:

Managing Director




Concentra Operating Corporation Second Amendment Signature Page



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Carlyle High Yield Partners VI, Ltd.

, as a Lender(name of institution)By:

/s/ Linda PaceName:

Linda PaceTitle:

Managing Director




Concentra Operating Corporation Second Amendment Signature Page



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Carlyle High Yield Partners IV, Ltd.

, as a Lender(name of institution)By:

/s/ Linda PaceName:

Linda PaceTitle:

Managing Director




Concentra Operating Corporation Second Amendment Signature Page



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Carlyle High Yield Partners VII, Ltd

, as a Lender(name of institution)By:

/s/ Linda PaceName:

Linda PaceTitle:

Managing Director




Concentra Operating Corporation Second Amendment Signature Page



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Fenway Capital, LLC

, as a Lender(name of institution)By:

/s/ Vidrik FrankfatherName:

Vidrik FrankfatherTitle:

Authorized Signor




Concentra Operating Corporation Second Amendment Signature Page



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Citicorp North America, Inc

, as a Lender(name of institution)By:

/s/ Rob ZiemerName:

Rob ZiemerTitle:

Vice President




Concentra Operating Corporation Second Amendment Signature Page



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CREDIT SUISSE, Caymen Islands Branch

, as a LenderBy:

/s/ RIANKA MOHANName:

RIANKA MOHANTitle:

VICE PRESIDENTBy:

/s/ JAMES NEIRAName:

JAMES NEIRATitle:

ASSOCIATE




Concentra Operating Corporation Second Amendment Signature Page



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Madison Park Funding

, as a LenderBy:

/s/ David H. LernerName:

David H. LernerTitle:

Authorized Signatory




Concentra Operating Corporation Second Amendment Signature Page



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Madison Park V

, as a LenderBy:

/s/ David H. LernerName:

David H. LernerTitle:

Authorized Signatory




Concentra Operating Corporation Second Amendment Signature Page



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First Dominion Funding III

, as a LenderBy:

/s/ David H. LernerName:

David H. LernerTitle:

Authorized Signatory




Concentra Operating Corporation Second Amendment Signature Page



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Castle Garden

, as a LenderBy:

/s/ David H. LernerName:

David H. LernerTitle:

Authorized Signatory




Concentra Operating Corporation Second Amendment Signature Page



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Deutsche Bank Trust Company Americas

, as a Lender(name of institution)By:

/s/ Carin KeeganName:

Carin KeeganTitle:

Vice PresidentBy:

/s/ Paul OhearyName:

Paul OhearyTitle:

Vice President




Concentra Operating Corporation Second Amendment Signature Page



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Flagship CLO IIBy: Deutsche Investment Management Americas, Inc. (as successor in interest to Deutsche Asset Management, Inc), As Sub-adviser

, as a LenderBy:

/s/ Eric S. MeyerEric S. Meyer, DirectorBy:

/s/ John E. ThierfelderJohn E. Thierfelder, Vice President




Concentra Operating Corporation Second Amendment Signature Page



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Flagship CLO IIIBy: Deutsche Investment Management Americas, Inc. (as successor in interest to Deutsche Asset Management, Inc), As Sub-adviserBy:

/s/ Eric S. MeyerEric S. Meyer, DirectorBy:

/s/ John E. ThierfelderJohn E. Thierfelder, Vice President




Concentra Operating Corporation Second Amendment Signature Page



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Flagship CLO IVBy: Deutsche Investment Management Americas, Inc. (as successor in interest to Deutsche Asset Management, Inc), As Sub-adviserBy:

/s/ Eric S. MeyerEric S. Meyer, DirectorBy:

/s/ John E. ThierfelderJohn E. Thierfelder, Vice President




Concentra Operating Corporation Second Amendment Signature Page



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Flagship CLO VBy: Deutsche Investment Management Americas, Inc. (as successor in interest to Deutsche Asset Management, Inc),By:

/s/ Eric S. MeyerEric S. Meyer, DirectorBy:

/s/ John E. ThierfelderJohn E. Thierfelder, Vice President




Concentra Operating Corporation Second Amendment Signature Page



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Aurum CLO 2002-1By: Deutsche Investment Management Americas, Inc. (as successor in interest to Deutsche Asset Management, Inc), As Sub-adviserBy:

/s/ Eric S. MeyerEric S. Meyer, DirectorBy:

/s/ John E. ThierfelderJohn E. Thierfelder, Vice President




Concentra Operating Corporation Second Amendment Signature Page



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EATON VANCE SENIOR INCOME TRUSTBY: EATON VANCE MANAGEMENTAS INVESTMENT ADVISOR

, as a Lender(name of institution)By:

/s/ Payson F. SwaffieldName:

Payson F. SwaffieldTitle:

Vice President




Concentra Operating Corporation Second Amendment Signature Page



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EATON VANCE INSTITUTIONAL SENIOR LOAN FUNDBY: EATON VANCE MANAGEMENTAS INVESTMENT ADVISOR

, as a Lender(name of institution)By:

/s/ Payson F. SwaffieldName:

Payson F. SwaffieldTitle:

Vice President




Concentra Operating Corporation Second Amendment Signature Page



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Eaton Vance CDO VII PLCBy: Eaton Vance Managementas Interim Investment Advisor

, as a Lender(name of institution)By:

/s/ Payson F. SwaffieldName:

Payson F. SwaffieldTitle:

Vice President




Concentra Operating Corporation Second Amendment Signature Page



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Eaton Vance CDO VIII, Ltd.By: Eaton Vance ManagementAs Investment Advisor

, as a Lender(name of institution)By:

/s/ Payson F. SwaffieldName:

Payson F. SwaffieldTitle:

Vice President




Concentra Operating Corporation Second Amendment Signature Page



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Eaton Vance CDO IX Ltd.By: Eaton Vance ManagementAs Investment Advisor

, as a Lender(name of institution)By:

/s/ Payson F. SwaffieldName:

Payson F. SwaffieldTitle:

Vice President




Concentra Operating Corporation Second Amendment Signature Page



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Eaton Vance CDO XI, LTDBy: Eaton Vance ManagementAs Investment Advisor

, as a Lender(name of institution)By:

/s/ Payson F. SwaffieldName:

Payson F. SwaffieldTitle:

Vice President




Concentra Operating Corporation Second Amendment Signature Page



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GRAYSON & CO  BY: BOSTON MANAGEMENT AND RESEARCH AS INVESTMENT ADVISOR

, as a Lender(name of institution)By:

/s/ Payson F. SwaffieldName:

Payson F. SwaffieldTitle:

Vice President




Concentra Operating Corporation Second Amendment Signature Page



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THE NORINCHUKIN BANK, NEW YORK BRANCH, through State Street Bank and Trust Company N.A as Fiduciary Custodian  By: Eaton Vance Management, Attorney-in-fact

, as a Lender(name of institution)By:

/s/ Payson F. SwaffieldName:

Payson F. SwaffieldTitle:

Vice President




Concentra Operating Corporation Second Amendment Signature Page



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EATON VANCE VT FLOATING-RATE INCOME FUNDBY: EATON VANCE MANAGEMENT AS
INVESTMENT ADVISOR

, as a Lender(name of institution)By:

/s/ Payson F. SwaffieldName:

Payson F. SwaffieldTitle:

Vice President




Concentra Operating Corporation Second Amendment Signature Page



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EATON VANCE LIMITED DURATION INCOMEFUNDBy: EATON VANCE MANAGEMENTAS INVESTMENT ADVISOR

, as a Lender(name of institution)By:

/s/ Payson F. SwaffieldName:

Payson F. SwaffieldTitle:

Vice President




Concentra Operating Corporation Second Amendment Signature Page



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EATON VANCE SENIOR FLOATING-RATETRUSTBy: EATON VANCE MANAGEMENTAS INVESTMENT ADVISOR

, as a Lender(name of institution)By:

/s/ Payson F. SwaffieldName:

Payson F. SwaffieldTitle:

Vice President




Concentra Operating Corporation Second Amendment Signature Page



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EATON VANCE FLOATING-RATE INCOMETRUSTBy: EATON VANCE MANAGEMENTAS INVESTMENT ADVISOR

, as a Lender(name of institution)By:

/s/ Payson F. SwaffieldName:

Payson F. SwaffieldTitle:

Vice President




Concentra Operating Corporation Second Amendment Signature Page



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EATON VANCE SHORT DURATION DIVERSIFIED INCOME FUNDBY: EATON VANCE MANAGEMENT, AS INVESTMENT ADVISOR

, as a Lender(name of institution)By:

/s/ Payson F. SwaffieldName:

Payson F. SwaffieldTitle:

Vice President




Concentra Operating Corporation Second Amendment Signature Page



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Eaton Vance Variable Leverage Fund Ltd.By: Eaton Vance Management As Investment
Advisor

, as a Lender(name of institution)By:

/s/ Payson F. SwaffieldName:

Payson F. SwaffieldTitle:

Vice President




Concentra Operating Corporation Second Amendment Signature Page



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Fraser Sullivan CLO I Ltd.,

as a Lender(name of institution)By:

/s/ Tighe P. SullivanName:

Tighe P. SullivanTitle:

Managing Director




Concentra Operating Corporation Second Amendment Signature Page



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Fraser Sullivan CLO II Ltd.,

as a Lender(name of institution)By:

/s/ Tighe P. SullivanName:

Tighe P. SullivanTitle:

Managing Partner




Concentra Operating Corporation Second Amendment Signature Page



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GENERAL ELECTRIC CAPITAL CORPORATION

, as a Lender(name of institution)By:

/s/ David R. CampbellName:

David R. CampbellTitle:

SVP




Concentra Operating Corporation Second Amendment Signature Page



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Halcyon Structured Asset Management CLO I Ltd.

, as a Lender(name of institution)By:

/s/ James W. SykesName:

James W. SykesTitle:

Managing Principal




Concentra Operating Corporation Second Amendment Signature Page



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The Hartford Mutual Funds, Inc., on behalf of the Hartford Floating Rate Fund by Hartford Investment Management Company, its sub-advisor, as a lender,By:

/s/ John P. ConnorName:

John P. ConnorTitle:

Senior Vice President




Concentra Operating Corporation Second Amendment Signature Page



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BANK OF MONTREAL, as a LenderBy: HIM Monegy, Inc., As AgentBy:

/s/ Jason AndersonName:

Jason AndersonTitle:

Associate




Concentra Operating Corporation Second Amendment Signature Page



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IKB Capital Corporation

, as a Lender(name of institution)By:

/s/ Mickey ChadhaName:

Mickey ChadhaTitle:

PM




Concentra Operating Corporation Second Amendment Signature Page



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|                                                            |  |                                                             |  |                                                             |  |                       
|----------------------------------------------------------- |  | ----------------------------------------------------------- |  | ----------------------------------------------------------- |  | ----------------------
|ING PRIME RATE TRUST                                        |  | ING Investment Management CLO I, Ltd.                      
|                                                            | 
|By: ING Investment Management Co. as its
investment manager |  | By: ING Investment Management Co. as its
investment manager
|                                                            |  |                                                             | 
|By:                                                         |  | /s/ Michel Prince, CFA                                      |  |                                                             |  | /s/ Michel Prince, CFA
|Name:                                                       |  | Michel Prince, CFA                                          |  | Name:                                                       |  | Michel Prince, CFA    
|Title                                                       |  | Senior Vice President                                       |  | Title:                                                      |  | Senior Vice President 
|                                                            | 
|ING SENIOR INCOME FUND                                      |  | ING International (II)  Senior Bank Loans Euro            
|                                                            | 
|By: ING Investment Management Co. as its
investment manager |  | By: ING Investment Management Co. as its
investment manager
|                                                            |  |                                                             | 
|By:                                                         |  | /s/ Michel Prince, CFA                                      |  |                                                             |  | /s/ Michel Prince, CFA
|Name:                                                       |  | Michel Prince, CFA                                          |  | Name:                                                       |  | Michel Prince, CFA    
|Title:                                                      |  | Senior Vice President                                       |  | Title:                                                      |  | Senior Vice President 
|                                                            |  |                                                            
|                                                            |  |                                                             |  | ING International (II)  Senior Bank Loans USD             
|                                                            |  |                                                            
|                                                            |  |                                                             |  | By: ING Investment Management Co. as its
investment manager
|                                                            |  |                                                             | 
|                                                            |  |                                                             |  |                                                             |  | /s/ Michel Prince, CFA
|                                                            |  |                                                             |  | Name:                                                       |  | Michel Prince, CFA    
|                                                            |  |                                                             |  | Title:                                                      |  | Senior Vice President 



Concentra Operating Corporation Second Amendment Signature Page



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LightPoint CLO VII, Ltd.By:

ILLEGIBLEName:Title:




Concentra Operating Corporation Second Amendment Signature Page



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LCM I LIMITED PARTNERSHIPBy:

Lyon Capital Management LLC,  As Collateral Manager

, as a LenderBy:

/s/ Sophie A. VenonName:

Sophie A. VenonTitle:

LYON CAPITAL MANAGEMENT LLC Portfolio
Manager




Concentra Operating Corporation Second Amendment Signature Page



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LCM II LIMITED PARTNERSHIPBy:

Lyon Capital Management LLC,  As Collateral Manager

, as a LenderBy:

/s/ Sophie A. VenonName:

Sophie A. VenonTitle:

LYON CAPITAL MANAGEMENT LLC Portfolio
Manager




Concentra Operating Corporation Second Amendment Signature Page



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LCM III, Ltd.By:

Lyon Capital Management LLC,  As Collateral Manager

, as a LenderBy:

/s/ Sophie A. VenonName:

Sophie A. VenonTitle:

LYON CAPITAL MANAGEMENT LLC Portfolio
Manager




Concentra Operating Corporation Second Amendment Signature Page



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LCM IV, Ltd.By:

Lyon Capital Management LLC,  As Collateral Manager

, as a LenderBy:

/s/ Sophie A. VenonName:

Sophie A. VenonTitle:

LYON CAPITAL MANAGEMENT LLC Portfolio
Manager




Concentra Operating Corporation Second Amendment Signature Page



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LCM V LTD.By: Lyon Capital Management LLC,as Attorney-in-Fact

, as a LenderBy:

/s/ Sophie A. VenonName:

Sophie A. VenonTitle:

LYON CAPITAL MANAGEMENT LLCPortfolio Manager




Concentra Operating Corporation Second Amendment Signature Page



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MERRILL LYNCH CAPITAL, a division of Merrill
Lynch Business Financial Services Inc, as a LenderBy:

/s/ Luis VieraName:

Luis VieraTitle:

Vice President




Concentra Operating Corporation Second Amendment Signature Page



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New York Life Insurance Company

, as a Lender(name of institution)By:

/s/ F. BertheletName:

F. BertheletTitle:

Corporate Vice President




|                                                |  |                                         
|----------------------------------------------- |  | ----------------------------------------
|New York Life Insurance and Annuity Corporation
|                                                | 
|By:                                             |  | New York Life Investment Management LLC,
|                                                |  | Its Investment Manager                  
|                                               
|/s/ F. Berthelet                               
|F. Berthelet                                   
|Director                                       



MainStay VP Floating Rate Portfolio, a
series of MainStay VP Series Fund, Inc.By:

New York Life Investment Management LLC/s/ F. BertheletF. BertheletDirector




|                                                            |  |                                        
|----------------------------------------------------------- |  | ---------------------------------------
|MainStay Floating Rate Fund, a series of EclipseFunds, Inc.
|                                                            | 
|By:                                                         |  | New York Life Investment Management LLC
|                                                           
|/s/ F. Berthelet                                           
|F. Berthelet                                               
|Director                                                   



NYLIM Institutional Floating Rate Fund L.P.By:

New York Life Investment Management LLC,its Investment Manager/s/ F. BertheletF. BertheletDirector




Concentra Operating Corporation Second Amendment Signature Page



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NYLIM Flatiron CLO 2003-1 Ltd.By:

New York Life Investment Management LLC,as Collateral Manager and Attorney-in-Fact

, as a Lender(name of institution)By:

/s/ F. BertheletName:

F. BertheletTitle:

Director




|                               |  |                                                                                    
|------------------------------ |  | -----------------------------------------------------------------------------------
|NYLIM Flatiron CLO 2004-1 Ltd.
|                               | 
|By:                            |  | New York Life Investment Management LLC, as
Collateral Manager and Attorney-in-Fact
|                              
|/s/ F. Berthelet              
|F. Berthelet                  
|Director                      



NYLIM Flatiron CLO 2005-1 Ltd.By:

New York Life Investment Management LLC, as
Collateral Manager and Attorney-in-Fact/s/ F. BertheletF. BertheletDirector




|                               |  |                                                                                    
|------------------------------ |  | -----------------------------------------------------------------------------------
|NYLIM Flatiron CLO 2006-1 Ltd.
|                               | 
|By:                            |  | New York Life Investment Management LLC, as
Collateral Manager and Attorney-in-Fact
|                              
|/s/ F. Berthelet              
|F. Berthelet                  
|Director                      



Concentra Operating Corporation Second Amendment Signature Page



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Octagon Investment Partners V, Ltd.By:

Octagon Credit Investors, LLCas Portfolio Manager

, as a LenderBy:

/s/ Michael B. NechamkinName:

Michael B. NechamkinTitle:

Portfolio Manager




Concentra Operating Corporation Second Amendment Signature Page



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Octagon Investment Partners VI, Ltd.By:

Octagon Credit Investors, LLCas collateral manager

, as a LenderBy:

/s/ Michael B. NechamkinName:

Michael B. NechamkinTitle:

Portfolio Manager




Concentra Operating Corporation Second Amendment Signature Page



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Octagon Investment Partners VII, Ltd.By:

Octagon Credit Investors, LLCas collateral manager

, as a LenderBy:

/s/ Michael B. NechamkinName:

Michael B. NechamkinTitle:

Portfolio Manager




Concentra Operating Corporation Second Amendment Signature Page



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Octagon Investment Partners VIII, Ltd.By:

Octagon Credit Investors, LLCas collateral manager

, as a LenderBy:

/s/ Michael B. NechamkinName:

Michael B. NechamkinTitle:

Portfolio Manager




Concentra Operating Corporation Second Amendment Signature Page



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Octagon Investment Partners IX, Ltd.By:

Octagon Credit Investors, LLCas Manager

, as a LenderBy:

/s/ Michael B. NechamkinName:

Michael B. NechamkinTitle:

Portfolio Manager




Concentra Operating Corporation Second Amendment Signature Page



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Octagon Investment Partners X, Ltd.By:

Octagon Credit Investors, LLCas Collateral Manager

, as a LenderBy:

/s/ Michael B. NechamkinName:

Michael B. NechamkinTitle:

Portfolio Manager




Concentra Operating Corporation Second Amendment Signature Page



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HY-FI Trust, by JPMorgan Chase Bank, N.A.(f/k/a JPMorgan Chase Bank)solely as trustee (and not in its individual capacity)By: Octagon Credit Investors, LLCas Portfolio Manager

, as a LenderBy:

/s/ Michael B. NechamkinName:

Michael B. NechamkinTitle:

Portfolio Manager




Concentra Operating Corporation Second Amendment Signature Page



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Oppenheimer Senior Floating Rate Fund

, as a LenderBy:

/s/ Jason ReuterName:

Jason ReuterTitle:

Manager




Concentra Operating Corporation Second Amendment Signature Page



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HarbourView CLO IV, Ltd

, as a LenderBy:

/s/ Jason ReuterName:

Jason ReuterTitle:

Manager




Concentra Operating Corporation Second Amendment Signature Page



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HarbourView CLO 2006-1, Ltd

, as a LenderBy:

/s/ Jason ReuterName:

Jason ReuterTitle:

Manager




Concentra Operating Corporation Second Amendment Signature Page



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Tuscany CDO, LimitedBy PPM America, Inc., as Collateral Manager, as a LenderBy:

/s/ David C. WagnerName:

David C. WagnerTitle:

Managing Director




Concentra Operating Corporation Second Amendment Signature Page



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SERVES 2006-1, Ltd.By PPM America, Inc., as Collateral Manager, as a LenderBy:

/s/ David C. WagnerName:

David C. WagnerTitle:

Managing Director




Concentra Operating Corporation Second Amendment Signature Page



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Loan Funding V, LLC, as a LenderBy:

/s/ W.C. PappasName:

W.C. PappasTitle:

Prudential Investment Management Inc., as Portfolio
Manager




Concentra Operating Corporation Second Amendment Signature Page



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Sankaty Advisors, LLC as Collateral Manager for A VERY POINT CLO, LTD., as Term Lender

, as a Lender(name of institution)By:

/s/ JEFFREY HAWKINSName:

JEFFREY HAWKINSTitle:

Executive Vice President




Concentra Operating Corporation Second Amendment Signature Page



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Sankaty Advisors, LLC as Collateral Manager for Castle Hill I-INGOTS, Ltd., as Term Lender

, as a Lender(name of institution)By:

/s/ JEFFREY HAWKINSName:

JEFFREY HAWKINSTitle:

Executive Vice President




Concentra Operating Corporation Second Amendment Signature Page



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Sankaty Advisors, LLC as CollateralManager for Castle Hill II-INGOTS, Ltd.,as Term Lender

, as a Lender(name of institution)By:

/s/ JEFFREY HAWKINSName:

JEFFREY HAWKINSTitle:

Executive Vice President




Concentra Operating Corporation Second Amendment Signature Page



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Sankaty Advisors, LLC as CollateralManager for Castle Hill III CLO,Limited, as Term Lender

, as a Lender(name of institution)By:



/s/ JEFFREY HAWKINSName:



JEFFREY HAWKINSTitle:



Executive Vice President




Concentra Operating Corporation Second Amendment Signature Page



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Sankaty Advisors, LLC as CollateralManager for Loan Funding XI LLC,As Term Lender

, as a Lender(name of institution)By:

/s/ JEFFREY HAWKINSName:

JEFFREY HAWKINSTitle:

Executive Vice President




Concentra Operating Corporation Second Amendment Signature Page



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Chatham Light II CLO, Limited, bySankaty Advisors LLC, as CollateralManager

, as a Lender(name of institution)By:

/s/ JEFFREY HAWKINSName:

JEFFREY HAWKINSTitle:

Executive Vice President




Concentra Operating Corporation Second Amendment Signature Page



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Katonah III, Ltd. by SankatyAdvisors LLC as Sub-Advisors

, as a Lender(name of institution)By:

/s/ JEFFREY HAWKINSName:

JEFFREY HAWKINSTitle:

Executive Vice President




Concentra Operating Corporation Second Amendment Signature Page



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Katonah IV, Ltd. by SankatyAdvisors, LLC as Sub-Advisors

, as a Lender(name of institution)By:

/s/ JEFFREY HAWKINSName:

JEFFREY HAWKINSTitle:

Executive Vice President




Concentra Operating Corporation Second Amendment Signature Page



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Sankaty Advisors, LLC as CollateralManager for Race Point CLO,Limited, as Term Lender

, as a Lender(name of institution)By:

/s/ JEFFREY HAWKINSName:

JEFFREY HAWKINSTitle:

Executive Vice President




Concentra Operating Corporation Second Amendment Signature Page



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Sankaty Advisors, LLC as CollateralManager for Race Point II CLO,Limited, as Term Lender

, as a Lender(name of institution)By:

/s/ JEFFREY HAWKINSName:

JEFFREY HAWKINSTitle:

Executive Vice President




Concentra Operating Corporation Second Amendment Signature Page



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Sankaty Advisors, LLC as CollateralManager for Race Point III CLO,Limited, as Term Lender

, as a Lender(name of institution)By:

/s/ JEFFREY HAWKINSName:

JEFFREY HAWKINSTitle:

Executive Vice President




Concentra Operating Corporation Second Amendment Signature Page



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Nob Hill CLO, Limited

, as a Lender(name of institution)By:

/s/ Bradley KaneName:

Bradley KaneTitle:

Portfolio Manager




Concentra Operating Corporation Second Amendment Signature Page



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Cervantes Portfolio LLCBy:

Shenkman Capital Management, Inc., as Investment AdvisorBy:

/s/ Richard H. WeinsteinName:

Richard H. WeinsteinTitle:

Executive Vice President




Concentra Operating Corporation Second Amendment Signature Page



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, as a LenderStone Tower Credit Funding I Ltd.By: Stone Tower Fund Management LLC..,As Its Collateral Manager./s/ MICHAEL W. DELPERCIOName:

MICHAEL W. DELPERCIOTitle:

AUTHORIZED SIGNATORY




Concentra Operating Corporation Second Amendment Signature Page



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, as a LenderGranite Ventures II Ltd.By: Stone Tower Debt Advisors LLC., As Its Collateral Manager./s/ MICHAEL W. DELPERCIOName:

MICHAEL W. DELPERCIOTitle:

AUTHORIZED SIGNATORY




Concentra Operating Corporation Second Amendment Signature Page



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, as a LenderGranite Ventures III Ltd.By: Stone Tower Debt Advisors LLC., As Its Collateral Manager./s/ MICHAEL W. DELPERCIOName:

MICHAEL W. DELPERCIOTitle:

AUTHORIZED SIGNATORY




Concentra Operating Corporation Second Amendment Signature Page



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, as a LenderRampart CLO I Ltd.By: Stone Tower Debt Advisors LLC., As Its Collateral Manager./s/ MICHAEL W. DELPERCIOName:

MICHAEL W. DELPERCIOTitle:

AUTHORIZED SIGNATORY




Concentra Operating Corporation Second Amendment Signature Page



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, as a LenderCornerstone CLO Ltd.,By: Stone Tower Debt Advisors LLC., As Its Collateral Manager./s/ MICHAEL W. DELPERCIOName:

MICHAEL W. DELPERCIOTitle:

AUTHORIZED SIGNATORY




Concentra Operating Corporation Second Amendment Signature Page



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, as a LenderStone Tower CLO VII Ltd.,By: Stone Tower Debt Advisors LLC., As Its Collateral Manager./s/ MICHAEL W. DELPERCIOName:

MICHAEL W. DELPERCIOTitle:

AUTHORIZED SIGNATORY




Concentra Operating Corporation Second Amendment Signature Page



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,as a LenderStone Tower CDO II Ltd.,By: Stone Tower Debt Advisors LLC., As ItsCollateral Manager./s/ MICHAEL W. DELPERCIOName:

MICHAEL W. DELPERCIOTitle:

AUTHORIZED SIGNATORY




Concentra Operating Corporation Second Amendment Signature Page



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,as a LenderStone Tower CLO VI Ltd.,By: Stone Tower Debt Advisors LLC., As ItsCollateral Manager./s/ MICHAEL W. DELPERCIOName:

MICHAEL W. DELPERCIOTitle:

AUTHORIZED SIGNATORY




Concentra Operating Corporation Second Amendment Signature Page



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, as a LenderStone Tower CLO V Ltd.,By: Stone Tower Debt Advisors LLC., As ItsCollateral Manager./s/ MICHAEL W. DELPERCIOName:

MICHAEL W. DELPERCIOTitle:

AUTHORIZED SIGNATORY




Concentra Operating Corporation Second Amendment Signature Page



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, as a LenderStone Tower CLO IV Ltd.,By: Stone Tower Debt Advisors LLC., As ItsCollateral Manager./s/ MICHAEL W. DELPERCIOName:

MICHAEL W. DELPERCIOTitle:

AUTHORIZED SIGNATORY




Concentra Operating Corporation Second Amendment Signature Page



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, as a LenderStone Tower CLO III Ltd.,By: Stone Tower Debt Advisors LLC., As ItsCollateral Manager./s/ MICHAEL W. DELPERCIOName:

MICHAEL W. DELPERCIOTitle:

AUTHORIZED SIGNATORY




Concentra Operating Corporation Second Amendment Signature Page



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, as a LenderGranite Ventures I Ltd.By: Stone Tower Debt Advisors LLC..,As Its Collateral Manager./s/ MICHAEL W. DELPERCIOName:

MICHAEL W. DELPERCIOTitle:

AUTHORIZED SIGNATORY




Concentra Operating Corporation Second Amendment Signature Page



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, as a LenderStone Tower CDO Ltd.By: Stone Tower Debt Advisors LLC..,As Its Collateral Manager./s/ MICHAEL W. DELPERCIOName:

MICHAEL W. DELPERCIOTitle:

AUTHORIZED SIGNATORY




Concentra Operating Corporation Second Amendment Signature Page



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The Sumitomo Trust & Banking Co., Ltd.,New York Branch, as a LenderBy:

/s/ Elizabeth A. QuirkElizabeth A. QuirkVice President




Concentra Operating Corporation Second Amendment Signature Page



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Trimaran CLO IV LtdBy Trimaran Advisors, L.L.C., as a LenderBy:

/s/ David M. MillisonName:

David M. MillisonTitle:

Managing Director




Concentra Operating Corporation Second Amendment Signature Page



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UBS LOAN FINANCE LLC, as a LenderBy:

/s/ Richard L. TavrowName:

Richard L. TavrowTitle:

DirectorBy:

/s/ Irja R. OtsaName:

Irja R. OtsaTitle:

Associate Director




Concentra Operating Corporation Second Amendment Signature Page



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WB Loan Funding 5, LLCBy:

/s/ Diana M. HimesName:

Diana M. HimesTitle:

Associate




Concentra Operating Corporation Second Amendment Signature Page



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Atlas Loan Funding (Hartford), LLCBy: Atlas Capital Funding, Ltd.By: Structured Asset Investors, LLCIts Investment Manager, as a LenderBy:

/s/ Diana M. HimesName:

Diana M. HimesTitle:

Associate




Concentra Operating Corporation Second Amendment Signature Page



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WACHOVIA BANK, NATIONAL ASSOCIATION

, as a Lender(name of institution)By:

/s/ Scott Santa CruzName:

Scott Santa CruzTitle:

Director




Concentra Operating Corporation Second Amendment Signature Page



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WhiteHorse III, Ltd.By:

WhiteHorse Capital Partners, L.P.As Collateral Manager

, as a LenderBy:

/s/ Ethan M. UnderwoodName:

Ethan M. Underwood, CFATitle:

Portfolio Manager




Concentra Operating Corporation Second Amendment Signature Page