As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF PILOT REPORTED THAT THEY RECEIVED 3 WARNINGS. 1. CABIN DOOR OPEN, 2. CABIN VENT DOOR OPEN AND A CABIN ALTITUDE WARNING. AFTER TROUBLESHOOTING FOUND THAT THE DOOR PROXIMITY SWITCH FAILED. THE SWITCH CONTROLS THE VENT DOOR WARNING AND THE CABIN DOOR WARNING INDICATIONS. FOUND CABIN VENT DOOR SEAL LOOSE CAUSING CABIN ALTITUDE NOT TO RISE