As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT NR 3716 REPORTED HAVING THE LT MAIN GEAR DOOR ADVISORY LIGHT REMAINING ILLUMINATED AFTER GEAR RETRACTION. AFTER GO AROUND IT WAS VERIFIED THAT THE DOOR WAS OPEN WITH GEAR UP. FLIGHT RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE CLEANED AND LUBED ASSOCIATED GEAR DOOR ACTUATOR AND LINKAGES. SYSTEM CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.