SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549


                                    FORM 10-K/A

[X]      Annual  report  pursuant  to  Section  13 or  15(d)  of the Securities
         Exchange   Act  of  1934   for the  period  from  October 1, 2001
         (Commencement of Operations) to December 31, 2001

[  ]     Transition report pursuant to Section 13 or 15(d) of the
         Securities Exchange Act of 1934 for the transition period from   to


                        Commission File Number 333-49820-20

              CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP.
             (Exact name of registrant as specified in its charter)

         Delaware                                          13-3320910
(State or other jurisdiction of                           I.R.S. Employer
incorporation or organization)                            Identification No.)

11 Madison Ave.
New York, New York                                             10010
(Address of Principal Executive Offices)                      (Zip Code)

       Registrant's telephone number, including area code :(212)538-3000

          CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP.
        CSFB MORTGAGE PASS-THROUGH CERTIFICATES SERIES 2001-26
       (Title of each class of securities covered by this Form)

Securities registered pursuant to Section 12(b) of the Act:  None
Securities registered pursuant to Section 12(g) of the Act:  None

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceding 12 months (or for such  shorter  period that the  registrant  was
required  to file  such  reports),  and  (2) has  been  subject  to such  filing
requirements for the past 90 days. Yes [X] No [ ]

     Indicate by check mark if disclosure of delinquent  filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's  knowledge,  in definitive proxy or information  statements
incorporated  by reference  in Part III of this Form 10-K/A or any  amendment to
this Form 10-K/A. [X]

Documents incorporated by reference:  None



<PAGE>
AMENDMENT 1 OF 1

CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP.
CSFB MORTGAGE PASS-THROUGH CERTIFICATES SERIES 2001-26
-----------------------------------------------------------------------


PART IV

Item 14. Exhibits, Financial Statement Schedules and Reports on Form 8-K

(a) The following documents are filed as part of this report:

    (1) Financial Statements:
         Omitted.

    (2)  Financial Statement Schedules:
         Omitted.

    (3)  Exhibits:

   Annual  Servicer  Statement of  Compliance,  filed as Exhibit 99.1 hereto.
   Annual Statement of  Independent  Accountants  Report for the Servicer,
           filed as Exhibit 99.2 hereto.

(b)   Reports on Form 8-K: The  following  Current  Reports on Form 8-K were
      filed by the Registrant during the last quarter of 2001.

     Current Reports on Form 8-K, dated November 26, 2001 and December 26, 2001,
were filed for the purpose of filing the Monthly  Statement  sent to the Holders
of the Offered  Certificates  for  payments  made on the same  dates.  The items
reported in such Current Report were Item 5 (Other Events).


(c)   Exhibits to this report are listed in Item (14)(a)(3) above.

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SIGNATURE

Pursuant to the  requirements of Section 13 or 15(d) of the Securities  Exchange
Act of 1934,  the  registrant  has duly  caused  this report to be signed on its
behalf by the undersigned thereunto duly authorized.


                                    JPMORGAN CHASE BANK,
                                    not in its individual capacity but solely
                                    as Trust Administrator under the Agreement
                                    referred to herein



Date:  August 22, 2002              /s/ Andreas Auer
                                    -----------------------------------
                                    Andreas Auer
                                    Vice President



                                      -3-
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                                 EXHIBIT INDEX

Exhibit     Description

 99.1       Servicer's Annual Statement of Compliance
 99.2       Servicer's Annual Independent Accountant's Report



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EXHIBIT 99.1 - Servicer's Annual Statement of Compliance


                                      -5-

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OLYMPUS Servicing, LP
9600 Great Hills Trail, Suite #200W
Austin, TX  78759

Tel:  512.349.8300
Fax:  512.349.8371
www.OlympusServicing.com


OFFICER CERTIFICATE


     A review of the  activities of the Servicer  during the preceding  calendar
year and of its performance under servicing agreements, including this Servicing
Agreement has been made under such officer's supervision and to the best of such
officer's knowledge.

     Based on such review,  the  Servicer has compiled in all material  respects
with the minimum servicing standards set forth in the Uniform Single Attestation
Program for Mortgage  Bankers and has fulfilled all of its material  obligations
in all material respects throughout such year.

/s/  Jeff Neal
Jeff Neal
Chief Operating Officer


                                      -6-
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Chase Manhattan Mortgage Corporation
3415 Vision Drive
Columbus, OH  43219
1-800-848-9136 Customer Service
1-800-582-0542 TDD/ Text Telephone

Chase Manhattan Mortgage Corporation
Master Servicing
1400 East Newport Center Drive
Deerfield Beach, FL  33442

RE:  Annual Certification

     Pursuant to the servicing  agreement,  the undersigned Officer certifies to
the following:

     a) All  hazard  (or  mortgage  impairment,  if  applicable)  flood or other
casualty  insurance and primary mortgage  guaranty  insurance  premiums,  taxes,
ground rents, assessments and other changes have been paid by/in connection with
the Mortgaged Properties;

     b) All property inspections have been completed;

     c) Compliance relative to Adjustable Rate Mortgages have been met;

     d) Compliance with IRS  Foreclosure  reporting  regulations  enacted as IRS
Section  6060J  by  the  Deficit  Reduction  Act,   regarding   Acquired  and/or
Abandonment property have been completed;

     e) All loans CMMC services in state that have statutes requiring payment of
interest on escrow/impound accounts have been completed;

     f) That such officer has confirmed  that the Fidelity  Bond, the Errors and
Omissions  Insurance Policy, and any other bonds required under the terms of the
Servicing Agreement are in full force and effect.

     g) Enclosed is a copy of our most recent independent audit statement.

CERTIFIED BY:  /s/ Lucy P. Gambino                Date:  March 29, 2002
              ------------------------------

Lucy P. Gambino
Vice President
Chase Manhattan Mortgage Corporation
3415 Vision Drive
Columbus, OH  43219


                                      -7-

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[CHASE logo]

                                                                Exhibit I
         Management's Assertion Concerning Compliance
           With USAP Minimum Servicing Standards


March 15, 2002

     As of and for the year ended December 31, 2001,  Chase  Manhattan  Mortgage
Corporation  ("CMMC") and Chase Mortgage Company ("CMC") and their  subsidiaries
(collectively,  the "Group")  have  complied in all material  respects  with the
mininum servicing  standards (the "Standards") set forth in the Mortgage Bankers
Association of America's Uniform Single Attestation Program for Mortgage Bankers
("USAP").  These  standards  are  applicable  only to Chase  Manhattan  Mortgage
Corporation's prime and subprime mortgage portfolios.

     As of and for same period, the Group had in effect fidelity bond and errors
and  omissions   policy  in  the  amounts  of   $250,000,000   and   $25,000,000
respectively.


/s/ Steve Rotella
--------------------------
Steve Rotella
Chief Executive Officer

/s/ Glenn Mouridy
--------------------------
Glenn Mouridy
Executive Vice President of Servicing

/s/ Terry L. Gentry
--------------------------
Terry L. Gentry
Senior Vice President of Servicing

/s/ Lucy Gambino
--------------------------
Lucy Gambino
Vice President of Risk Management

                                      -8-

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EXHIBIT 99.2 - Servicer's Annual Independent Accountant's Report


                                      -9-
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KPMG
111 Congress Avenue, Suite 1100
Austin, TX  78701

Tel:  512.320.5200
Fax:  512.320.5100


INDEPENDENT ACCOUNTANTS' REPORT

General and Limited Partners
Olympus Servicing L.P.

     We have  examined  management's  assertion,  included  in the  accompanying
Management  Assertion,  that Olympus  Servicing  L.P.  complied with the minimum
servicing  standards set forth in the Mortgage Bankers  Association of America's
Uniform Single  Attestation  program for Mortgage Bankers as of and for the year
ended December 31, 2001.  Management is responsible for Olympus Servicing L.P.'s
compliance with those minimum  servicing  standards.  Our  responsibility  is to
express an opinion on management's assertion about the Partnership's  compliance
based on our examination.

     Our  examination  was  made  in  accordance  with  attestations   standards
established  by the  American  Institute of Certified  Public  Accountants  and,
accordingly,  included  examining,  on a  test  basis,  evidence  about  Olympus
Servicing L.P.'s compliance with the minimum servicing standards specified above
and  performing  such  other  procedures  as  we  considered  necessary  in  the
circumstances.  We believe that our examination  provides a reasonable basis for
our opinion.  Our examination does not provide a legal  determination on Olympus
Servicing L.P.'s compliance with the minimum servicing standards.

     In our opinion, management's assertion that Olympus Servicing L.P. complied
with the aforementioned minimum servicing standards as of and for the year ended
December 31, 2001 is fairly stated, in all material respects.

/s/  KPMG LLP

January 25, 2002

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PricewaterhouseCoopers LLP
1177 Avenue of the Americas
New York, NY  10036
Telephone (646) 471-4000
Facsimile (646) 471-4100


Report of Independent Accountants

To the Board of Directors and Stockholder
Of Chase Manhattan Mortgage Corporation:

     We have examined  management's  assertion  about Chase  Manhattan  Mortgage
Corporation's  (the "Company")  compliance with the minimum servicing  standards
("standards")  identified  in the  Mortgage  Bankers  Association  of  America's
Uniform Single  Attestation  Program for Mortgage Bankers ("USAP") as of and for
the year December 31, 2001  included in the  accompanying  management  assertion
(see  Exhibit I). The  Company  performs  loan  subservicing  functions  for the
residential  loan servicing  portfolios of its affiliates Chase Mortgage Company
and Chase Mortgage  Company West.  Management is  responsible  for the Company's
compliance with those minimum  servicing  standards.  Our  responsibility  is to
express an opinion on management's assertion about the entity's compliance based
on our examination.

     Our examination  was made in accordance  with standards  established by the
American  Institute of Certified Public Accountants and,  accordingly,  included
examining,  on a test basis,  evidence about the Company's  compliance  with the
standards and performing such other procedures as we considered necessary in the
circumstances.  We believe that our examination  provides a reasonable basis for
our  opinion.  Our  examination  does not provide a legal  determination  on the
Company's compliance with the standards.

     In our opinion,  management's  assertion that the Company complied with the
aforementioned  standards  as of and for the year  ended  December  31,  2001 is
fairly stated, in all material respects.

/s/ PricewaterhouseCoopers LLP

March 15, 2002