What was found
SAT - FLT 249 - DURING CRUISE, NR 1 HYDRAULIC QTY DEPLETED TO ZERO. CREW FOLLOWED ALTERNATE PROCEDURES TURNING OFF SYSTEM NR 1 PUMPS ON ENGINES 1 AND 2. LANDING GEAR ALTERNATE PROCEDURES WERE FOLLOWED AND THE AIRCRAFT LANDED SAT WITH NO FURTHER INCIDENT. REPLACED LEAKING O-RING ON RIGHT ENGINE DRIVEN HYDRAULIC PUMP SYSTEM NR 1. SERVICED HYDRAULIC SYSTEM AND RAN ENGIEN WITH NO FURTHER LEAKS NOTED. SYSTEM LEAK CHECKED AND GROUND CHECKED NORMAL OPERATION. (M)