As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER GEAR UP, AIRCRAFT FAILED TO PRESSURIZE AND STALL INDICATION FAILURE LIGHT CAME ON AT FLAPS 5 DEGREES. MAINTENANCE FOUND OUTFLOW VALVE WAS INLOCKED OPEN/MANUAL POSITION ON PEDESTAL. RETURNED TO OPEN/AUTO POSITION. ALSO REMOVED AND REPLACED LEFT ANGLE OF ATTACK SENSOR.