As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AIRCRAFT WOULD NOT PRESSURIZE AFTER TAKEOFF. OUTFLOW VALVE STUCK OPEN. ATTEMPTED STANDBY, ALSO STUCK OPEN. AC MODE CLOSED OUTFLOW VALVE ONLY AFTER MOVING SWITCH TO OPEN, THEN CLOSE. AUTO APPEARS TO NOT WORK. FOOUND OUTFLOW VALVE INTERMITTENT IN MANUAL AC/DC. OUTFLOW VALVE REPLACED PER MM 21-31-11.