What was found
DFW - FLT 1431 - EN ROUTE DFW-ONT, DETECTED NR 1 ENGINE HYDRAULIC PUMP FAILURE. AIR INTERRUPTED, RETURNED DFW AND LANDED WITHOUT FURTHER INCIDENT. REPLACED NR 1 SIDE ENGINE HYDRAULIC PUMP. ACCOMPLISHED LEAK CHECK. NO LEAKS NOTED. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)