(a) By mandamus or other suit, action or proceeding, at law or in equity, enforce all rights of the bondholders, including the right to require the city to collect rates, rentals, and other charges adequate to carry out any agreement as to or pledge of the revenues or receipts of the sewer system or sewage treatment works, and to require the city to carry out any other agreements with or for the benefit of the bondholders, and to perform its and their duties under this act.

(b) Bring suit upon the bonds.

(c) By action or suit in equity require the city to account as if it were the trustee of an express trust for the bondholders.

(d) By action or suit in equity enjoin any acts or things which may be unlawful or in violation of the rights of the bondholders.

(e) By notice in writing to the city declare all bonds due and payable, and if all defaults shall be made good, then, with the consent of the holders of twenty-five per centum (or such other percentage as may be specified in any deed of trust, indenture or other agreement aforesaid) of the principal amount of the bonds then outstanding, to annul such declaration and its consequences.

The court of common pleas of the county shall have jurisdiction of any suit, action or proceedings by the trustee on behalf of the bondholders. Any trustee, whether appointed as aforesaid or acting under a deed of trust, indenture or other agreement, and whether or not all bonds have been declared due and payable, shall be entitled as of right to the appointment of a receiver, who may enter and take possession of the sewer system or sewage treatment works, or any part or parts thereof, the revenues or receipts from which are or may be applicable to the payment of the bonds so in default, and operate and maintain the same and collect and receive all rentals and other revenues thereafter arising therefrom, in the same manner as the city, and shall deposit all such moneys in a separate account, and apply the same in such manner as the court shall direct. In any suit, action or proceeding by the trustee, the fees, counsel fees, and expenses of the trustee and of the receiver, if any, and all costs and disbursements allowed by the court, shall be a first charge on any revenues and receipts derived from the sewer system or sewage treatment works, the revenues or receipts from which are or may be applicable to the payment of the bonds so in default. Said trustee shall, in addition to the foregoing, have and possess all of the powers necessary or appropriate for the exercise of any functions specifically set forth herein, or incident to the general representation of the bondholders in the enforcement and protection of their rights.