As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APPROACH, THE LEFT MAIN LANDING GEAR GREEN LIGHT DID NOT ILLUMINATE AFTER GEAR EXTENSION. CREW EXECUTED GO-AROUND PROCEDURES AND RECYCLED GEAR. NORMAL INDICATIONS WERE ACHIEVED ON SECOND ATTEMPT. AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE COULD NOT DUPLICATE DISCREPANCY ON GROUND. REPLACED LEFT MAIN GEAR DOWNLOCK SWITCH AS A PRECAUTION.