As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN REPORTED YELLOW HYDRAULIC RESERVOIR OVERHEAT PRIOR TO DESCENT. YELLOW PUMP OPERATION WAS RESTORED PRIOR TO LANDING. AN EMERGENCY WAS DECLARED - AIRCRAFT LANDED AND PROCEEDED TO GATE WITH NO FURTHER ISSUES. MAINTENANCE REMOVED AND REPLACED YELLOW SYSTEM TEMPERATURE SWITCH IAW AIRBUS MAINTENANCE MANUAL 29-33-11.