As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JUST PRIOR TO APPROACH, RECEIVED ECAM MESSAGE 'HYD Y RSVR LO LVL'. FOLLOWED COM AND LANDED UNEVENTFULLY. ECAM INDICATED NEAR TOTAL LOSS OF FLUID. FOUND PRIORITY VALVE AT PTU MANIFOLD LEAKING. REPLACED PRIORITY VALVE AND SERVICED YELLOW HYDRAULIC RESERVOIR. LEAK AND FUNCTIONAL CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.