As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING APPROACH, LEFT MAIN LANDING GEAR GREEN DOWNLOCK LIGHT DID NOT ILLUMINATE AFTER GEAR EXTENSION. CREW RECYCLED GEAR AND VERIFIED VISUALLY THROUGH PERISCOPE THAT GEAR WAS DOWN AND LOCKED. GREEN LIGHT ILLUMINATED AFTER BULB REPLACEMENT. AIRCRAFT LANDED WITHOUT INCIDENT. DISCREPANCY COULD NOT BE DUPLICATED BY MAINTENANCE ON GROUND, OPERATIONAL CHECK NORMAL.