With respect to the holders of Debentures issued hereunder, the Trustee, prior to the occurrence of an Event of Default with respect to the Debentures and after the curing or waiving of all Events of Default which may have occurred, with respect to the Debentures, undertakes to perform such duties and only such duties as are specifically set forth in this Indenture, and no implied covenants shall be read into this Indenture against the Trustee. In case an Event of Default with respect to the Debentures has occurred (which has not been cured or waived), the Trustee shall exercise such of the rights and powers vested in it by this Indenture, and use the same degree of care and skill in their exercise, as a prudent man would exercise or use under the circumstances in the conduct of his own affairs.