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 MADE EXCESSIVE NOISE AFTER TAKEOFF WITH THE GEAR RETRACTED. THE FLIGHT WAS RETURNED. MAINTENANCE FOUND THAT THE RT NOSE GEAR DOOR WAS OPEN. INSPECTED DOOR AREA. NO DEFECTS NOTED. CLOSED DOOR. COMPLIED WITH MCC LOG TO SWING NOSE GEAR AND CHECK DOOR OPERATION IAW AMM 32-00-00 101. NO DEFECTS NOTED.