As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE- YELLOW HYDRAULIC QUANTITY LOW ECAM WARNING REPORTED LOW. LATER CAPTAIN REPORTED THAT THE SYSTEM HAD EMPTIED. AN EMERGENCY WAS DECLARED, FLIGHT LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS GROUNDED. INSPECTION FOUND LEAK FROM YELLOW RESERVOIR DRAIN VALVE. REPLACED YELLOW RESEVOIR DRAIN VALVE PER AMM 29-13-41-400-005-A. CHECKED NO LEAKS NOTED. SERVICED YELLOW HYDRAULIC SYSTEM PER AMM 12-12-29-611-001-A. OK FOR SERVICE.