As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT INTO 12J, LANDING GEAR SELECTED TO DOWN POSITION, THE LEFT MAIN LANDING GEAR GREEN ANNUNCIATOR FAILED TO ILLUMINATE. BULB CHECK WAS GOOD. FOLLOWED CHECKLIST DIVERTED TO KPNS. LANDING WAS UNEVENTFUL. MAINTENANCE REPLACED THE LEFT MAIN LANDING GEAR DOWN LOCK SWITCH. GEAR SWINGS PERFORMED WITH NO DEFECTS NOTED. AIRCRAFT WAS RETURNED TO SERVICE.