As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
40 MINUTES AFTER DEPARTING, DURING CRUISE AT FL 380 THE CREW ADVISED VIA ACARS THAT THEY HAD LOST THEIR GREEN HYD SYS DUE TO A LOW PRESS ECAM INDICATION. THE FLIGHT RETURNED & AN EMER DECLARED. FOUND NR 1 ENG DRIVEN PUMP GREEN SYS SUPPLY LINE PYLON BULK HEAD FITTING ORING WAS CRACKED. THE ORING WAS REPLACED IAW AMM .20-29-00-911-002-A. SERVICED HYD SYS IAW AMM.12-12-29-611-001-A. LEAK & OPERATIONAL CHECKED GOOD.