Action on Behalf of the Borrower. Any action required or permitted to be taken, and any documents required or permitted to be executed, under the Trust Fund Credit Agreement on behalf of the Borrower may be taken or executed by the representative of the Borrower designated in the Trust Fund Credit Agreement for the purposes of this Section or any person thereunto authorized in writing by such representative. Any modification or amplification of the provisions of the Trust Fund Credit Agreement may be agreed to on behalf of the Borrower by written instrument executed on behalf of the Borrower by the representative so designated or any person thereunto authorized in writing by such representative, provided that, in the opinion of such representative, such modification or amplification is reasonable in the circumstances and will not substantially increase the obligations of the Borrower under the Trust Fund Credit Agreement. The Trustee may accept the execution by such representative or other person of any such instrument as conclusive evidence that in the opinion of such representative any modification or amplification of the provisions of the Trust Fund Credit Agreement effected by such instrument is reasonable in the circumstances and will not substantially increase the obligations of the Borrower thereunder.