What was found
DFW - FLT 504 - DURING CLIMB-OUT FROM DFW, HYDRAULIC SYSTEM NR 1 INDICATED OVERHEAT CONDITION. CREW FOLLOWED ALTERNATE PROCEDURES TURNING OFF SYSTEM NR 1 PUMPS ON ENGINES ONE AND TWO. AFTER A FEW MINUTES THE OVERHEAT INDICATION STOPPED AND THE AIRCRAFT AIR INTERRUPTED, RETURNED AND LANDED DFW WITHOUT FURTHER INCIDENT. REPLACED ENGINE DRIVEN HYDRAULIC PUMP (SYSTEM NR 1) ON NR 1 ENGINE, CHECKS OK WITH NO OVERHEATING. SYSTEM GROUND/LEAK CHECKED NORMAL OPERATION. (M)