What was found
FLIGHT 702, PHL-FRA - APPROXIMATELY 1 HOUR INTO FLIGHT AT FL370-GREEN HYDRAULIC LOW QUANITY-MONITORED-AND STILL CONTINUED TO DROP B/O MID HASH MARK. COMPLETED PROCEDURE, FREE FELL GEAR NORMAL (NOT OVERWEIGHT) LANDING. MAINTENANCE FOUND GREEN HYDRAULIC SYSTEM LINE LEAKING FROM HYDRAULIC PRESS REGULATOR TO MANIFOLD, REMOVED AND REPLACED HYDRAULIC LINE, LEAK CHECKS GOOD.