What was found
TOTAL LOSS OF HYDRAULIC FLUID ON THE NR 1 HYD SYSTEM IN FLIGHT. REMOVED NR 1 HYDRAULIC SYSTEM PRESSURE SWITCH CODE (L30GI) P/N 7G979, S/N 1722 AND REPLACED WITH NEW SWITCH P/N 7G979 , S/N 2784. REMOVED NR 1 & NR 2 ENGINE HYDRAULIC PUMPS AND INSPECTED FLUID AND PUMP CONDITION. NO DEFECTS NOTED. RE-INSTALLED NR 1 & NR 2 ENGINE HYDRAULIC PUMPS. PERFORM OPERATIONAL CHECKS AND LEAK CHECKS ON NR 1 & NR 2 ENGINE HYDRAULIC SYSTEM IAW 29-104 & 29-100, NO DEFECTS NOTED. SERVICED HYDRAULIC SYSTEMS 1 & 2 TO CORRECT LEVELS WITH 5606 FLUID IAW 29-112.