What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED COMMING INTO CLT DUE TO THE FLIGHT CREW REPORTING THAT DURING CRUISE A GREEN HYDRAULIC SYTEM ENGINE PUMP #1 LOW PRESSURE MESSAGE DISPLAYED AND THE SYSTEM QUANITY WAS REFLECTING LITTLE TO ZERO. FLIGHT CREW FOLLOWED ECAM PROCEDURES AND SHUT OFF THE PUMP. FLIGHT CREW ACCOMPLSHED A MANUAL GEAR EXTENSION AND LANDED SAFELY WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND THE #1 ENGINE HYDRAULIC PUMP DELIVERY CHECK VALVE 1050GM LEAKING AND REPLACED IT PER AMM 29-11-36. A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED.