As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING DESCENT THE FLIGHT CREW NOTICED THE PRESSURIZATION WOULD NOT INITIALLY RESPOND TO THE CHANGING ALTITUDE, THEN IT WOULD CAUSE A RAPID CABIN PRESSURE CHANGE TO CATCH UP WITH THE AIRCRAFT ALTITUDE. POST FLIGHT TROUBLESHOOTING LED TO THE CHANGE OF THE AUTOMATIC PRESSURE CONTROLLER AND THE AIRCRAFT RETURNED TO SERVICE.