What was found
LP NR 256794-1; AFTER TAKEOFF, LT GEAR UNSAFE LIGHT (RED) REMAINED ON, FOLLOWED QRH, WHEN RT ENGINE HYDRAULIC PUMP WAS TURNED OFF DOOR UNSAFE LIGHT CAME ON, TURNED PUMP BACK ON FOR DURATION OF FLIGHT. INSPECTED LT UP GEAR SENSOR AIR GAP, FOUND TO BE TOO MUCH, ADJUSTED SENSOR AIR GAP, CHECKED SENSOR PERF. PROX BITE CHECK NEAR/FAR SENSOR AND CARD OK, NO FAULTS NOTED.