What was found
THE CREW REPORTED THAT AT THE TOP OF DESCENT AC PRESSURIZATION STARTED CLIMBING, ONLY WENT TO 11600 CABIN ALLTITUDE, MASKS NEVER DROPPED, CYCLING ELEVATION CAUSED THE SYS TO BEGIN WORKING. THE ACFT LANDED WITHOUT INCIDENT WHERE MX R & R THE DIGITAL PRESSURIZATION CONTROLLER, OPERATIONALLY TESTED WITH NO DEFECTS, AND THE ACFT WAS APPROVED FOR RETURN TO SERVICE.