As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 86 - PHX-PDX - EMERGENCY LANDING - AT CRUISE ALTITUDE, ECAM CLASS 1 MESSAGE: Y HYD LOW LVL. FLUID WAS LOW. SHUT DOWN Y HYDRAULIC PUMP PER ECAM. CREW DECLARED AN EMERGENCY AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED HYDRAULIC ACCUMULATOR O-RING AND SERVICED ACCUMULATOR.