(1) Any proceeding to enforce a mortgage, pledge or other lien upon property of the trust estate;
(2) Any proceeding to quiet title or reform any instrument with respect to title to property; or
(3) To the limits of the insurance protection only, any proceeding to establish liability of the settlor or the trustee for which the settlor or trustee is protected by liability insurance at the time the proceeding is commenced. [Formerly 128.294]