As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THAT DURING CRUISE, THE CABIN PRESSURIZATION RATE STARTED TO CLIMB 2500FPM. THE CREW FOLLOWED THE QRH AND SWITCHED TO MANUAL MODE. MANUAL MODE WAS SLOW TO RESPOND. MAINTENANCE REPLACED THE DIGITAL PRESSURIZATION CONTROLLER. OPERATIONAL CHECKS OF BOTH THE AUTO AND MANUAL PRESSURIZATION MODES WERE GOOD WITH NO FURTHER DEFECTS NOTED.