As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ECAM MESSAGE "HYD Y RSVR LO LVL" APPEARED DURING DESCENT. HYDRAULIC SYSTEM ECAM PAGE INDICATED YELLOW HYDRAULIC RESERVOIR QUANTITY WAS EMPTY. PERFORMED COM PROCEDURE, WITH APPROACH AND LANDING UNEVENTFUL. REPLACED O-RING FOR CHECK VALVE ON THE YELLOW HP MANIFOLD, LEAK CHECKS OK.