What was found
LEFT GEAR INDICATED UNSAFE AFTER NORMAL GEAR EXTENSION, NO GREEN LIGHT. COMPLIED WITH RED TAB PROCEDURES, STILL NO GREEN LIGHT, BUT POINTER WAS IN GREEN BAND. ON FINAL APPROACH APPROXIMATELY 160 KTS GREEN LIGHT ILLUMINATED RECYCLED GEAR TRIED NEGATIVE G, BUT UNSUCCESSFUL. REMOVED AND REPLACED LEFT HAND MAIN GEAR DOWNLOCK SENSOR AS PER MAINTENANCE MANUAL 32-61-91, NO HELP. FOUND LANDING GEAR INSTRUMENT MODULE PANEL BAD. ORDERED SAME, REMOVED AND REPLACED LANDING GEAR INSTRUMENT MODULE, SYSTEM OPERATIONAL AND FUNCTIONS NORMAL.