What was found
AIRCRAFT WAS GROUNDED: YELLOW HYDRAULIC RESERVOIR LOW LEVEL ECAM MESSAGE, FLIGHT CREW ACCOMPLISHED THE ECAM PROCEDURE, DECLARED AN EMERGENCY AND RETURNED TO DFW WHERE THE AIRCRAFT LANDED SAFELY AND WAS TOWED OFF THE RUNWAY. **SUPPLEMENTAL REPORT FOR AALA202109309841: MAINTENANCE FOUND YELLOW HYDRAULIC QUANTITY AT ZERO, SERVICED THE SYSTEM, RAN THE #2 ENGINE AND NOTED THE HYDRAULIC OUTLET IN BOARD PRESSURE LINE ON THE #2 ENGINE, ENGINE DRIVEN PUMP LEAKING AND CHAFFED. REPLACED LINE AND ACCOMPLISHED A SATISFACTORY LEAK / OPERATIONAL CHECK PER AMM 29-13-49 AND AMM 29-13-51** (CLOSED)