As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) APPROXIMATELY 25 MINUTES AFTER TAKEOFF THE CABIN ALTITUDE BEGAN TO RISE. THE CREW WAS UNABLE TO CONTROL PRESSURIZATION AND PERFORMED AN EMERGENCY DESCENT TO FL180. THE MAXIMUM CABIN ALTITUDE REACHED WAS 10500FT, THE OXYGEN MASKS DID NOT DEPLOY. EMERGENCY WAS DECLARED AND LATER REDUCED TO PANPAN, LANDING WAS APPROXIMATELY 5500KG OVER MAXIMUM LANDING WEIGHT. NR 1 PACK FLOW CONTROL VALVE INOP. PACK FCV REPLAPLACED AS PER AMM 21-51-51 PB401 OPS NORMAL CONSIDERED SERVICABLE.