As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEAR DISAGREE AFTER T/O WITH GEAR HANDLE UP AND GEAR STILL DOWN. RAN QRH AND FOUND MAN GEAR EXTENSION ACCESS DOOR LOOSE/AJAR. GEAR RETRACTED AFTER MAN GEAR EXTENSION ACCESS DOOR WAS RESET. GROUNDED - YES. CHECKED AND VERIFIED NO DEFECTS TO MAN GEAR EXTENSION DOOR OPERATIONAL CHECK GOOD. A/C OK FOR FLIGHT.