Performance of Covenant by Trustee. If the Corporation fails to perform any of its covenants contained in this Indenture, the Trustee may itself perform any of such covenants capable of being performed by it, but will be under no obligation to do so. All sums expended or advanced by the Trustee for such purpose will be repayable as provided in Section 5.8 of this Indenture. No such performance or advance by the Trustee shall relieve the Corporation of any default hereunder or its continuing obligations hereunder.