What was found
THREE MINUTES AFTER TAKEOFF, CREW OBSERVED EICAS MESSAGE, LEFT HYDRAULIC SYSTEM QUANTITY AND QUANTITY DROPPED TO .20; SYSTEM WAS DEPRESSURIZED. ALL GEAR EXTENSIONS AND ALT FLAP EXTENSIONS ACCOMPLISHED FOLLOWED BY AN UNEVENTFUL LANDING. UPON INVESTIGATION, THE HYDRAULIC HOSE TO THE LEFT GEAR DOWNLOCK ACTUATOR WAS FOUND LEAKING AT SWAGED FITTING. HOSE ASSEMBLY REPLACED, SYSTEM SERVICED AND LEAK CHECKED. (X)