Section 3154 - Affidavit and oath(a) Fiduciary and witness.--The affidavit to a petition for the grant of letters and the oath of the fiduciary relative to the performance of his duties and, except as provided in subsection (b), the oath of a witness relative to probate of a will shall be taken before and administered by: (1) Within the Commonwealth.--The register of any county of the Commonwealth.(2) Outside of the Commonwealth.--A public officer of another jurisdiction having duties similar to those of a register who has been authorized to do so by the register of the county where the application for letters is to be made.(b) Subscribing witness.--Unless there is a contest with respect to the validity of the will or unless the will is signed by mark or by another under section 2502(2) or (3) (relating to form and execution of a will), the oath of a subscribing witness relative to probate of a will may be taken before an officer authorized to administer oaths under the laws of this Commonwealth or under the laws of another state.1972, June 30, P.L. 508, No. 164, § 2, eff. July 1, 1972. Amended 1988, July 14, P.L. 553, No. 99, § 1, imd. effective.