As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 247 OAK-LGB, HYDRAULIC RESERVOIR QUANTITY SLOWLY DECLINED DURING THE DESENT, GOT THE HYD Y RES LOW LEVEL ECAM ON FINAL APPROACH. GO AROUND PERFORMED CHECKLIST RUN AND LANDING WITH MANUAL BRAKES PERFORMED. QUANTITY IN CHOCKS WAS ZERO. T/S AND FOUND PARKING BRAKE VALVE (2579GM) LEAKING. REMOVED AND REPLACED PARKING BRAKE VALVE PER 32-45-14. OPS/LEAK CHECK GOOD. SERVICED HYD SYS AS REQ'D. OK FOR SERVICE.