What was found
ON TAKEOFF IMMEDIATELY AFTER SELECTING FLAPS TO 2 DEGREES FROM 5 DEGREES, EXPERIENCED A SYSTEM HYDRAULIC LOSS QTY AND PRESSURE DECREASED RAPIDLY TO 0. SYSTEM B NORMAL THROUGHOUT. MAINTENANCE FOUND ACTUATOR LINE IN NLG WHEELWELL LEAKING. REPLACED LINE, SERVICED HYDRAULIC SYSTEM TO FULL, INSPECTED CASE DRAIN FILTERS ON ALL 3 ENGINES ALL OK. RAN ENGINES AND ALL FLIGHT CONTROLS. ALL HYDRAULIC SYSTEMS CHK OK.