As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHX - EMERGENCY LANDING - FLT 506 - DURING CRUISE, EN ROUTE TO PHX, CREW RECEIVED ECAM MSG HYD Y RSVR LO LVL. CREW MADE PRECAUTIONARY EMERGENCY LANDING IN PHX. LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REMOVED AND REPLACED UNION O-RINGS ON THE HYDRAULIC POWER TRANSFER UNIT MANIFOLD. LEAK CHECKS WERE GOOD.