As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EN ROUTE TO PHX, CREW REPORTED 'HYD G RSVR LO LVL' ECAM MESSAGE. CREW SHUT OFF ENGINE NR 1 PUMP AND DIVERTED TO CLT DECLARING AN EMERGENCY. FLIGHT LANDED WITHOUT INCIDENT BUT AIRCRAFT WAS OVERWEIGHT AT 155.000. MAINTENANCE FOUND A BLOWN OUT O-RING ON NR 1 ENGINE PUMP LOW PRESSURE SWITCH. REPLACED O-RING IAW AIRBUS MAINTENANCE MANUAL 29-11-17.