As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THAT THE NLG DOOR OPENED IN FLIGHT. THE ACFT RETURNED TO DEPARTURE, WHERE IT LANDED WITHOUT INCIDENT. MX R & R THE LANDING GEAR CONTROL LEVER, OPS TESTED WITH NO DEFECTS, AND THE ACFT WAS APPROVED FOR RETURN TO SERVICE.