What was found
FLT 460 - EWR - GEAR DOOR OPEN LIGHT ON IN FLIGHT, WENT OUT WITH HYD IN HIGH POSITION. NO OTHER UNSAFE CONDITIONS PRESENT IN GEAR HANDLE. CLEANED GEAR DOOR SWITCH FOUND GREASE ON TARGET, ACCOMPLISHED PROXIMITY TEST OF GEAR DOOR WIRING, NO DEFECTS NOTED. OPS CHECK OF GEAR WARNING SYSTEM OK IAW MM 32-60-05. (M)