As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURNED TO AIRPORT, AFTER TAKEOFF LANDING GEAR DOOR WILL NOT CLOSE AFTER GEARS WERE RETRACTED. CLEANED ALL LANDING GEAR UPLOCK SWITCHES, 3G SWITCH AND RESEATED 6G RELAY. OPS CHECKED LANDING GEAR WITH HYD MULE. NO DEFECTS NOTED OPS CHECKED GOOD.