As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN MODERATE TURBULENCE, AUTOPILOT KICKED OUT AND RECEIVED YELLOW HYDRAULIC SYSTEM RESERVOIR LOW LEVEL MESSAGE ON ECAM. FOLLOWED COM PROCEDURE AND LANDED AT DTW UNEVENTFULLY. FOUND YELLOW SYSTEM COMPLETELY EMPTY. FOUND SPOILER HYDRAULIC PRESSURE LINE CHAFED ON WIRING RACEWAY. REPAIRED LINE WITH RING-LOK REPAIR PER AMM. SERVICED YELLOW HYDRAULIC RESERVOIR. SYSTEM LEAK CHECK OIK. AIRCRAFT RETURNED TO SERVICE.