As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: ON APPROACH, RECIEVED ECAM GREEN HYDRAULIC LOW LEVEL INDICATION. AN EMEERGENCY WAS DECLARED AND THE AIRCRAFT LANDED SAFELY WITHOUT FURTHER INCIDENT. FOUND LEFT MAIN LANDING GEAR UPLOCK VALVE HYDRAULIC B-NUT ON LINE FOR DOOR DOWN SYSTEM TO BE LOOSE AND LEAKING. TIGHTENED B NUT AND ACCOMPLISHED A SATISFACTORY LEAK AND OPERATIONAL CHECK.