What was found
LEFT MLG INDICATOR LIGHT FAILED TEST - UPON GEAR EXTENSION INTO KMIA, THE LEFT MAIN GEAR LIGHT DID NOT ILLUMINATE. WE DID AN EMERGENCY GEAR EXTENSION AFTER A FAILED GEAR LIGHT TEST. WE HAD A MOMENTARY GEAR HORN CHIRP IN THE AIR AND ON THE GROUND AFTER WE LANDED AND CLEARED THE RUNWAY. WE THEN SHUT DOWN AND WERE TOWED IN. ADDITIONAL INFO CORRECTIVE ACTION: RELAMPED BOTH DOWN AND LOCK INDICATION LAMPS.