As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE EN ROUTE AT FL370 GOT ECAM WARNING FOR GREEN HYD RESV LOW. RESV QUANTITY ECAM WAS IN THE RED. PRESSURE INDICATED ZERO. DIVERTED TO KPHX. GEAR EXTENDED BY GRAVITY. REMOVED AND REPLACED GREEN YELLOW POWER TRANSFER UNIT PER MM 29-23-11-4. REQUIRES BLEEDING, OPS AND LK CHECK PER STEP D.10. REMOVED AND REPLACED NR 1 ENG GREEN SYSTEM HYDRAULIC PUMP PER M/M 29-11-32-4 AND PUMP CASE DRAIN FILTER PER M/M 29-11-36-4 LEAK AND OP'S CHECK GOOD.