The manufacturer of any equipment or utensil which has been issued a report or certification stating acceptance of compliance shall resubmit the design and fabrication details of any change in materials of construction, design, or fabrication which may impair the cleanability or hygienic design of the equipment or utensil. If no change in materials of construction, design, or fabrication which may impair the cleanability or hygienic design of the equipment or utensil has occurred during the period of four years after the date of the most recent report stating acceptance of compliance or if no design or fabrication changes have been made, the applicant may submit a certificate of conformance signed by the chief engineering officer and the chief executive officer of the company stating that no design changes have been made to the specified equipment or utensil.