What was found
DFW INFLIGHT - CREW REPORTED NR 1 ENGINE HYDRAULIC LOW PRESSURE LIGHT CAME ON AT FL410 FOLLOWED BY NR 2 ENGINE HYDRAULIC PUMP LOW PRESSURE INDICATION. CREW TURNED OFF BOTH RIGHT AND LEFT ENGINE DRIVEN HYDRAULIC PUMPS. LANDED DFW WITHOUT INCIDENT. REPLACED NR 1 AND 2 ENGINE HYDRAULIC FILTER ELEMENTS AND NR 1 ENGINE HYDRAULIC FILTER HOUSING DUE TO SPRING INOPERATIVE. SYSTEM GROUND CHECKED NORMAL OPERATION.