As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE LEFT MLG RED UNSAFE LIGHT ILLUMINATED AFTER GEAR WAS EXTENDED ON APPROACH. EMERGENCY PROCEDURES WERE COMPLIED WITH PER AIRCRAFT FLIGHT MANUAL AND THE AIRCRAFT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE LT MLG DOWNLOCK PROXIMITY SENSOR AT FAULT. THE SENSOR WAS REPLACED PER MM 32-61-31 AND GROUND OPERATION/TEST WAS NORMAL.