As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FERRY FLIGHT TO DALLAS, PILOT REPORTED THAT DURING CABIN PRESSURE STARTED TO CLIMB. SWITCHED TO MANUAL DC AND ATTEMPTED TO CLOSE OUTFLOW VALVE. VALVE WENT TO FULL CLOSE UNCOMMANDED BUMPED SWITCH TO OPEN AND VALVE DROVE FULL OPEN. ALL O2 MASKS DROPPED. REMOVED AND REPLACED PRESS CONTROL PANEL PER MM.