What was found
ON APPROACH, GEAR SELECTED DOWN, THE LT MAIN GEAR LIGHT DID NOT ILLUMINATE. ROTARY TEST CONFIRMED LT MAIN GEAR INDICATOR LIGHTS WERE INOPERATIVE. CREW RAN THE CHECK LIST PROCEDURE FOR EMERGENCY GEAR EXTENSION. TOWER CONFIRMED ALL 3 LANDING GEARS WERE DOWN. ACFT LANDING WAS UNEVENTFUL. MX REPLACED ALL 4 LIGHT BULBS IN THE GEAR INDICATOR LIGHT ASSY, SERVICED THE N2 SYS, BLED THE HYD SYS AND CYCLED THE LANDING GEARS SEVERAL TIMES. SYS OPS CHECK WAS GOOD. ACFT RETURNED TO SERVICE.