All work performed by a licensee shall be recorded on a statement describing all service work done and all parts supplied with reasonable particularity, identifying parts by name, designating whether new or used parts were installed, and indicating the exact charge for each part or service. One copy shall be given to the customer and one copy retained by the licensee for a period of at least one year. The licensee shall return replaced parts, other than the picture tube, to the customer, except such parts as the licensee is required to return to the manufacturer or distributor under a warranty or exchange arrangement. (Ord. 13966)