As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) EN-ROUTE TO DESTINATION, FLIGHT EXPERIENCED ECAM MESSAGE FOR YELLOW HYDRAULIC SYS LOW LEVEL. ECAM PROCEDURE WAS CARRIED OUT AND SYS WAS SHUTDOWN. MAINTENANCE CONTROL ADVISED. RESOLUTION FOUND HYDRAULIC LEAK AT PTU MANIFOLD CK. VALVE 3094 GM. REPLACED O-RING + REINSTALLED CHEK VALVE IAW AMM 29-13-15-400-001 A. FUNCTION + LEAK CHEKED PTU IAW AMM 29-23-00-710-002A. SERVICEABLE.