As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW REPORTED THAT WHILE IN CRUISE AT F/L 200 CABIN ALTITUDE CLIMBED TO 14000 FEET WITH ASSOCIATED WARNINGS AND MASKS AUTOMATICALLY DEPLOYING. AIRCRAFT RETURNED TO BASE WHERE MAINTENANCE CHANGED LT FLOW PACK, AND THE PRESSURIZATION CONTROLLER. GROUND RUNS WERE CARRIED OUT WITH NO FURTHER DEFECTS NOTED. AIRCRAFT WAS FLOWN FOR OPERATIONAL CHECK OF PRESSURIZATION SYSTEM WITH NO DEFECTS NOTED.