As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMBOUT FROM PHX, CAPTAIN SENT ACARS TO MAINTENANCE - ECAM "HYD GRN RSVR LOW LVL". CREW DECLARED AN EMERGENCY AND RETURNED TO FIELD AT PHX. AIRCRAFT HAD YO BE TOWED TO THE GATE. MAINTENANCE FOUND HYDRAULIC FLEX LINE AT PRESSURE TRANSMITTER NR 1 ENGINE LEAKING. REMOVED AND REPLACED HYDRAULIC LINE. SERVICED GREEN HYDRAULIC RESERVOIR PER AMM 12-12-29. RAN NR 1 ENGINE. NO HYDRAULIC LEAKS NOTED. GREEN HYDRAULIC SYSTEM OPS NORMAL.