What was found
DURING CRUISE ON SCHEDULED FLIGHT, EXPERIENCED LOSS OF GREEN HYD SYS-SYS INDICATED TOTAL LOSS OF FLUID. ECAM HYD G RSVR LO LVL, LANDING GEAR MANUAL EXTENSION ACCOMPLISHED. DIVERTED AND LANDED WITHOUT INCIDENT. MX CONTACTED AND FOUND HYD LEAK AT ENGINE NR 1 PYLON PRESSURE OUTLET HOSE AND CHECK VALVE. THE LEAK WAS IDENTIFIED TO BE FROM A DAMAGED O-RING. REMOVED CHECK VALVE TO FACILITATE CHANGING THE O-RING. THE O-RING WAS REPLACED AND THE CHECK VALVE REINSTALLED, PERFORMED LEAK CHECK, NO LEAKS NOTED.