Wash. Rev. Code § 46.71.021
Except for parts covered by a manufacturer's or other warranty or parts that must be returned to a distributor, remanufacturer, or rebuilder, the repair facility shall return replaced parts to the customer at the time the work is completed if the customer requested the parts at the time of authorization of the repair. If a customer at the time of authorization of the repair requests the return of a part that must be returned to the manufacturer, remanufacturer, distributor, recycler, or rebuilder, or must be disposed of as required by law, the repair facility shall offer to show the part to the customer. The repair facility need not show a replaced part if no charge is being made for the replacement part.
RCW 46.71.021
Severability-Effective date-1993 c 424: See notes following RCW 46.71.005.