As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF AND RETRACTING THE GEAR WE RECEIVED NOSE GEAR DOOR OPEN WARNING MESSAGE. AFTER COMPLYING WITH THE QRH THE MESSAGE REMAINED. NO AIRSPEED OR STRUCTURAL LIMITATIONS WERE EXCEEDED, LANDING WAS NORMAL. FLIGHT 4264-FILED CLOSED. FOUND CANNON PLUG TO NOSE GEAR DOOR CHECK VALVE OFF, RECONNECTED. OPERATIONS CHECK GOOD AMM. OPERATIONS CHECK OF NOSE GEAR DOOR AMM. OK FOR SERVICE.