As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AIRCRAFT DIVERTED AND UNSCHEDULED LANDING WHEN PRESSURIZATION SYSTEM WOULD NOT CONTROL CABIN PRESSURE BELOW 10,000 FEET, A/C IN CRUISE AT 25,000 FEET. A/C DESCENT AND DEPRESSURIZATION WAS INITIATED. REPLACED CABIN PRESSURE CONTROLLER AND OUTFLOW VALVE. ALSO, REPLACED RT COALESCER BAG. A/C RETURNED TO SERVICE.