What was found
GSO - FLT 4071 - REPORTED 'NR 1 HYD LO QTY', 'NR 1 ENG HYD PUMP FAIL IN-FLIGHT', AND 'EMERG GEAR EXTENSION PROCEDURE C/W'. FOUND LT HYDRAULIC PRESSURE SUPPLY SWITCH LEAKING. REMOVED AND REPLACED SWITCH, REFILLED SYSTEM. OPS CHECKED PUMPS GOOD, LEAK CHECKED GOOD. ACFT TT: 1,371.8 HOURS. ACFT CYCLES: 1,117. (X)