What was found
(CAN) UNABLE TO PRESSURIZE AIRCRAFT AFTER TAKEOFF, AVIONIC EXTRACT VALVE SHOWED OPENED. EXTRACT VALVE REPLACED, AIRCRAFT CHECK SERVICEABLE.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
(CAN) UNABLE TO PRESSURIZE AIRCRAFT AFTER TAKEOFF, AVIONIC EXTRACT VALVE SHOWED OPENED. EXTRACT VALVE REPLACED, AIRCRAFT CHECK SERVICEABLE.