What was found
(CAN) ON APPROACH, CREW EXPERIENCED THREE GREEN, DOWN AND LOCKED, LIGHTS AS WELL AS THE RED, IN-TRANSIT, LIGHT. CREW ELECTED TO OVERSHOOT AND CYCLE THE GEAR. AFTER THE SECOND EXTENSION OF THE GEAR, THE, IN-TRANSIT, LIGHT EXTINGUISHED AND THE ACFT LANDED. MAINTENANCE PERFORMED A DETAILED INSPECTION, CLEANED AND CHECKED THE GEAR SWITCHES, AND RETURNED THE ACFT TO SERVICE.