As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, YELLOW HYDRAULIC RESERVOIR OVERHEAT LIGHT WOULD NOT EXTINQUISH EVEN AFTER TURNING OFF ENGINE PUMP, ELECTRIC PUMP AND POWER TRANSFER UNIT IAW ECAM. DECLARED AN AMERGENCY. MAINTENANCE REPLACED YELLOW HYDRAULIC SYSTEM TEMPERATURE TRANSMITTER PRESSURE SWITCH IAW TSM 29-13-00 AND AMM 29-33-11. AIRCRAFT WAS GROUNDED.