Document:

<PAGE>   1
                                                                   EXHIBIT 10.15

                                   HPSC, INC.
                     SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN

                                 THIRD AMENDMENT
                                 ---------------

       WHEREAS, HPSC, Inc. (the "Company") maintains the HPSC, Inc. Supplemental
Executive Retirement Plan (the "Plan") for the benefit of certain eligible
executive employees;

       WHEREAS, the Company desires to amend the Plan to change the definition
of Compensation; NOW, THEREFORE, the Plan is amended effective January 1, 2000,
as follows:

1.     Section 2.11 is deleted and replaced with the following:

              2.11   COMPENSATION. The total salary plus bonuses and similar
               types of remuneration earned by a Participant for personal
              services rendered to an Employing Company for any Plan Year,
              regardless of when such remuneration is actually paid (or would be
              paid if not deferred pursuant to any deferred compensation plan).
              Compensation shall include (a) amounts deferred under any deferred
              compensation plan and (b) amounts contributed from the
              Participant's remuneration under any plan maintained by an
              Employing Company pursuant to Code Sections 125, 132, 401(k), or
              any other Code provision which provides tax benefits to an
              employee on account of a voluntary reduction in compensation. The
              base salary component of a Participant's Compensation during his
              or her final calendar year of Service shall be deemed to equal the
              Participant's annual base salary at the time of his or her
              Separation from Service. Compensation shall not include (x)
              employer contributions to any employee benefit plan (including
              without limitation this Plan) and all benefits provided under any
              such plan and (y) the value of or any income from any types of
              equity-based compensation programs (including without limitation
              stock options, stock appreciation rights and restricted stock).

2.     The first paragraph of Section 2.31 is deleted and replaced with the
following:

              2.31   TARGET RETIREMENT BENEFIT. The Actuarial Equivalent of a
              retirement benefit payable on a Participant's Normal Retirement
              Date and continuing for the Participant's life in an amount equal
              to [((a) minus (b)) times (c)] minus (d). For purposes of the
              preceding sentence (a) equals the percentage of the Participant's
              Average Final Compensation shown for the Participant on Schedule
              2.31, as amended from time to time, (b) equals fifty percent of
              the Participant's Primary Insurance Amount ("PIA") as determined
              in accordance with the following paragraph, (c) equals a fraction
              not greater than 1.0, the numerator of which

<PAGE>   2
              equals the Participant's total Years of Benefit Service as of the
              date of determination and the denominator equals fifteen (15) and
              (d) equals his or her Other Retirement Benefits.

3.     New Schedule 2.31, as follows, is hereby added to the Plan immediately
following the signature page:

                            '' SCHEDULE 2.31 TO THE
                HPSC, INC. SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN

     (Designation of Target Retirement Benefit percentages for Participants
                        EFFECTIVE AS OF JANUARY 1, 2000)

        Participant                    Target Retirement Benefit Percentage of
                                              Average Final Compensation

      John W. Everets                                   55%
      Raymond Doherty                                   50%
      Rene Lefebvre                                     50%

       IN WITNESS WHEREOF the Company has caused this amendment to be executed
by its duly authorized officer this 28 day of March, 2000.

                                        HPSC, INC.

                                        By: /s/ John W. Everets
                                            ----------------------------------
                                            Chairman and CEO
                                            ----------------------------------
                                            Title<PAGE>   1
                                                                   EXHIBIT 10.32

                                 AMENDMENT NO. 3
                                       to
                      LEASE RECEIVABLES PURCHASE AGREEMENT
                            Dated as of June 27, 1997

         THIS AMENDMENT NO. 3 ("AMENDMENT") dated as of April 4, 1999, is
entered into among HPSC CAPITAL FUNDING, INC., a Delaware corporation
("FUNDING"), as Seller (the "SELLER"), EAGLEFUNDING CAPITAL CORPORATION, a
Delaware corporation ("EAGLEFUNDING"), as Purchaser (the "PURCHASER"), HPSC,
INC., a Delaware corporation ("HPSC"), as Servicer (the "SERVICER") and as
Custodian (the "CUSTODIAN"), and BANCBOSTON ROBERTSON STEPHENS INC., a
Massachusetts corporation ("BRS"), as Deal Agent (the "DEAL AGENT"). Capitalized
terms used herein without definition shall have the meanings ascribed thereto in
the "Receivables Purchase Agreement" referred to below.

         PRELIMINARY STATEMENTS. Each of the Seller, the Servicer, the
Custodian, the Purchaser and the Deal Agent are parties to that certain Lease
Receivables Purchase Agreement dated as of June 27, 1997, as amended pursuant to
Amendment No. 1 dated as of January 30, 1998, and Amendment No. 2 dated as of
April 30, 1998 (the "Receivables Purchase Agreement").

         The Seller, the Servicer and the Custodian have agreed with the Deal
Agent and the Purchaser to make an amendment to the Receivables Purchase
Agreement. Each of the parties hereto has consented to the proposed amendment,
as hereinafter set forth.

         SECTION 1. AMENDMENT TO THE RECEIVABLES PURCHASE AGREEMENT. The
Receivables Purchase Agreement is, effective as of the date first written above
and subject to the satisfaction of the conditions precedent set forth in Section
2 hereof, hereby amended to delete the reference to "$150,000,000" in the
definition of the term "Purchase Limit" set forth in Appendix A of the
Receivables Purchase Agreement, and to replace the same with a reference to
"$125,000,000".

         SECTION 2. CONDITIONS PRECEDENT. This amendment shall become effective
as of April 4,1999 upon receipt by the DealAgent or its counsel of (i)
counterpart signature pages of this Amendment, executed by each of the parties
hereto, (ii) counterpart signature pages of Amendment No. 2 to the Liquidity
Agrement, dated as of April 30, 1999, executed by each of the parties thereto.

         SECTION 3. COVENANTS, REPRESENTATIONS AND WARRANTIES OF THE SELLER
AND THE SERVICER.

         (a) Upon the effectiveness of this Amendment, each of the Seller, the
Servicer and the Custodian hereby (i) reaffirms all covenants, representations
and warranties made by it in the Receivables Purchase Agreement to the extent
the same are not amended hereby, (ii) agrees that all such covenants,
representations and warranties shall be deemed

<PAGE>   2

to have been re-made as of the effective date of this Amendment, and (iii)
represents and  warrants  that no Event of Termination, Unmatured Event of
Termination, Wind-Down Event, Unmatured Wind-Down Event, Servicing Termination
Event or event which with the giving of notice or the passage of time or both
would constitute a Servicing Termination Event, is in effect or is continuing.

         (b) Each of the Seller, the Servicer and the Custodian hereby
represents and warrants that this Amendment constitutes its legal, valid and
binding obligation, enforceable against such Person in accordance with its
terms.

         SECTION 4. REFERENCE TO AND EFFECT ON THE FACILITY DOCUMENTS.

         (a) Upon the effectiveness of this Amendment, (i) each reference in the
Receivables Purchase Agreement to "this EagleFunding Purchase Agreement", "this
Agreement", "hereunder", "hereof", "herein" or words of like import shall mean
and be a reference to the Receivables Purchase Agreement, as amended hereby, and
(ii) each reference to the Receivables Purchase Agreement in any other Facility
Document, or any other document, instrument or agreement executed and/or
delivered in connection therewith, shall mean and be a reference to the
Receivables Purchase Agreement as amended hereby.

         (b) Except as specifically amended above, the terms and conditions of
the Receivables Purchase Agreement, of all other Facility Documents and any
other documents, instruments and agreements executed and/or delivered in
connection therewith, shall remain in full force and effect and are hereby
ratified and confirmed.

         (c) The execution, delivery and effectiveness of this Amendment shall
not operate as a waiver of any right, power or remedy of the Deal Agent or the
Purchaser under the Receivables Purchase Agreement or any other Facility
Document or any other document, instrument or agreement executed in connection
therewith, nor constitute a waiver of any provision contained therein, in each
case except as specifically set forth herein.

         SECTION 5. EXECUTION OF COUNTERPARTS. This Amendment may be executed in
any number of counterparts and by different parties hereto in separate
counterparts, each of which when so executed and delivered shall be deemed to be
an original and all of which taken together shall constitute but one and the
same instrument.

         SECTION 6. GOVERNING LAW. This Amendment shall be governed by and
construed in accordance with the laws of the State of New York.

         SECTION 7. HEADINGS. Section headings in this Amendment are included
herein for convenience of reference only and shall not constitute a part of
this Amendment for any other purpose.

<PAGE>   3

         IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
executed by their respective officers thereunto duly authorized as of the date
first above written.

                                 HPSC CAPITAL FUNDING, INC.

                                 By: /s/ John W. Everets
                                    --------------------------------
                                    Title: President

                                 Sixty State Street
                                 35th Floor
                                 Boston, MA 02109-1803
                                 Attn: President
                                 Telecopy: (617) 720-7299

                                 HPSC, INC., as Servicer and as Custodian

                                 By: /s/ John W. Everets
                                    --------------------------------
                                    Title:  Chairman

                                 By: /s/ Rene Lefebvre
                                    --------------------------------
                                    Title:  Chief Financial Officer

                                 Sixty State Street
                                 35th Floor
                                 Boston, MA 02109-1803
                                 Attn: Vice President, Finance
                                 Telecopy: (617) 720-7272

<PAGE>   4

                                   EAGLEFUNDING CAPITAL CORPORATION

                                   By: BancBoston Robertson Stephens Inc.,
                                       its attorney-in-fact

                                       By: /s/ John T. Hackett III
                                          ------------------------------
                                          Title:   Director

                                   100 Federal Street
                                   Boston, MA 02110
                                   Telecopy: (617) 434-1533

                                   BANCBOSTON ROBERTSON STEPHENS
                                   INC., as Deal Agent

                                   By: /s/ John T. Hackett III
                                      ---------------------------------
                                      Title:   Director

                                   100 Federal Street
                                   Boston, MA 02110
                                   Telecopy: (617) 434-1533

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00005-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00005-of-00352.parquet"}]]