What was found
LOW HYDRAULIC PRESSURE ON APPROACH, AIRCRAFT RETURNED, MAINTENANCE BASE. FOUND HYDRAULIC LEAK AT LT MAIN GEAR ACTUATOR FITTING, HYDRAULIC FLUID LEVEL LOW. LEAK CAUSED BY NICKED O-RING. REPLACED O-RING, SERVICED HYDRAULIC SYSTEM, OPERATIONAL CHECKED SPOILER, FLAP, AND LANDING GEAR SYSTEMS, ALL NORMAL. OPERATIONAL CHECKED BOTH ENGINE DRIVEN HYDRAULIC PUMPS, BOTH NORMAL. AIRCRAFT RETURNED TO SERVICE.