As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HYD, CREW DECLARED AN EMERGENCY DUE TO A YELLOW HYDRAULIC RESERVOIR LOW LEVEL ECAM MESSAGE. CORRECTIVE ACTION: FOUND A LEAKING CONNECTION ON THE PRESSURE HOSE AT THE UPPER PYLON INTERFACE PANEL. RE-TORQUED HOSE. DRY MOTORED AND PERFORMED IDLE ENGINE RUN WITH NO LEAK FOUND.