California Code, Business and Professions Code - BPC § 9884.17

The bureau shall design and approve of a sign which shall be placed in all automotive repair dealer locations in a place and manner conspicuous to the public.  That sign shall give notice that inquiries concerning service may be made to the bureau and shall contain the telephone number and Internet Web site address of the bureau.  The sign shall also give notice that the customer is entitled to a return of replaced parts upon his or her request therefor at the time the work order is taken.