What was found
DIVERSION - ON TAKEOFF AIRCRAFT WOULD NOT PRESSURIZE NORMAL. OUTFLOW VALVE CLOSED. REMOVED AND REPLACED NEGATIVE PRESSURE RELIEF VALVE PER MM.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
DIVERSION - ON TAKEOFF AIRCRAFT WOULD NOT PRESSURIZE NORMAL. OUTFLOW VALVE CLOSED. REMOVED AND REPLACED NEGATIVE PRESSURE RELIEF VALVE PER MM.