15 Pa. C.S. § 5750
The indemnification and advancement of expenses provided by or granted pursuant to this subchapter shall, unless otherwise provided when authorized or ratified, continue as to a person who has ceased to be a representative of the corporation and shall inure to the benefit of the heirs and personal representative of that person. A right to indemnification or to advancement of expenses arising under a provision of the articles or bylaws may not be eliminated or impaired by an amendment to or repeal of the provision after the occurrence of an act that is the subject of the threatened, pending or completed action or proceeding, whether civil, criminal, administrative or investigative, for which indemnification or advancement of expenses is sought, unless the provision in effect at the time of the act explicitly authorizes the elimination or impairment after an act has occurred.
15 Pa.C.S. § 5750