What was found
HPN- FLIGHT#3665. CREW REPORTED LANDING GEAR WOULD NOT EXTEND NORMALLY, GEAR HANDLE SELECTED AND ONLY RED IN-TRANSIT LIGHTS CAME ON, MAIN AND NOSE GEAR WOULD NOT EXTEND. ALTERNATE EXTENSION PERFORMED. MAINTENANCE INSPECTED WIRING AT INHIBIT SWITCH, SELECTOR VALVE AND WING ROOT. VERIFIED POWER AT SELECTOR VALVE WITH GEAR HANDLE UP AND DOWN. DEICE FLUID CLEANED FROM VALVE, AND WING ROOT CANNON PLUGS. PROBLEM REOCCURED FLIGHT#9381. MAINTENANCE REPLACED GEAR SELECTOR VALVE PANEL. PROBLEM REOCCURED FLIGHT#6841. MAINTENANCE OPERATIONAL CHECKED GEAR AND INSPECTED WIRING AND CANNON PLUGS. NO DEFECTS WERE NOTED. LANDING GEAR SELECTOR VALVE REPLACED FOR TROUBLESHOOTING. OPERATIONAL AND LEAK CHECK GOOD. AIRCRAFT RETURNED