What was found
FLT#76, MSY-JFK. (AIRCRAFT DECLARED A EMERGENCY INTO JFK) 'ECAM G RSVR LO LVL. SO WE HAD A TOTAL LOSS OF GREEN SYS HYD. MANUAL GEAR EXTENDED; FOUND HI PRESSURE UNION O RING. REMOVED AND REPLACED O RING, SERVICED AND LEAK CHECKED SYSTEM PER AMM 29-11-15. OPS CHECK IS GOOD.'