What was found
ON FINAL APPROACH, LOWERED GEAR AT FAF - NO LEFT MAIN GEAR LIGHT. CYCLED GEAR ONCE INSIDE FAF - STILL NO LIGHTS, EXECUTED FLY BY RWY 4R. 2 AIRLINE CREWS ADVISED ALL 3 GEARS APPEAR DOWN. FLEW LT TRAFFIC, CYCLED GEAR 3RD TIME, OBSERVED GEAR RETRACT AND EXTEND. (K)