As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, WHEN MLG RETRACTED THE DOOR NOT LATCH LIGHT REMAINED ON. THE CREW CYCLED MLG AND LIGHT REMAINED ON. THEY RETURNED TO DEPARTURE WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE LT MLG PROXIMITY SWITCH. OPERATIONAL CHECK GOOD IAW MM 32-60-0. AIRCRAFT WAS RETURNED TO SERVICE.