As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DTW - EMERGENCY LANDING - FLT 0231 - ON DESCENT INTO DTW EN ROUTE FROM PHX ECAM DISPLAYED YELLOW HYDRAULIC RESERVOIR LOW LEVEL, DECLARED EMERGENCY AND LANDED WITHOUT FURTHER EVENT. MAINTENANCE DISCOVERED A HYDRAULIC LEAK WHERE HYDRAULIC LINE CONNECTS TO AUTO-BRAKE SELECTOR VALVE. REMOVED AND REPLACED O-RING PACKING, SERVICED RESERVOIR AND PERFORMED LEAK CHECK, NO LEAKS NOTED.