The manufacturer or dealer shall provide to the purchaser each time the purchaser's vehicle is returned from being serviced or repaired a fully itemized statement indicating all work performed on said vehicle including, but not limited to, parts and labor. It shall be the duty of a dealer to notify the manufacturer of the existence of a nonconformity within seven days of the delivery by a purchaser of a vehicle subject to a nonconformity when it is delivered to the same dealer for the second time for repair of the same nonconformity. The notification shall be by certified mail, return receipt requested.