Any provision of this Agreement may be amended, modified, supplemented or waived if, but only if, such amendment, modification, supplement or waiver is in writing and is signed by each of API, the Borrower and the Required Banks (and, if the rights or duties of the Administrative Agent are affected thereby, by the Administrative Agent); provided that no such amendment, modification, supplement or waiver shall, unless signed by each Bank directly affected thereby, (i) subject to Sections 2.04 and 2.05 , increase or decrease the Commitment of any Bank or subject any Bank to any additional obligation, (ii) reduce the principal of or rate of interest on any Loan or L/C Borrowing or any fees hereunder, (iii) postpone the date fixed for any payment of principal of or interest on any Loan or any fees hereunder or for any reduction or termination of any Commitment (it being understood and agreed, however, that the Required Banks may modify the terms of any “springing maturity” under clause (c) of the definition of “Termination Date” to reduce the 91 day period therein to not less than 45 days, but not to waive such “springing maturity”) or (iv) extend or postpone the scheduled date of expiration of the Letter of Credit facility established pursuant to Section 2.09 ; and provided further that (1) no such amendment, modification, supplement or waiver shall, unless signed by all the Banks (A) release API from the API Limited Recourse Guaranty, (B) amend or waive the provisions of this Section 11.04 , the definition of “Required Banks” or any provision that explicitly requires the consent of all the Banks or (C) amend Section 4.01 or the definition of “Pro Rata Share” in a manner that would alter the manner in which payments are shared, (2) no amendment, waiver or consent shall, unless in writing and signed by the applicable L/C Issuer in addition to the Banks required above, affect the rights or duties of such L/C Issuer under this Agreement or any Issuer Document relating to any Letter of Credit issued or to be issued by it and (3) no Bank consent is required to effect an increase in Commitments pursuant to Section 2.04 or an Extension Amendment (except as expressly provided in Sections 2.04 or 2.10 , as applicable).