What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO MIA DUE TO THE THE FLIGHT CREW REPORTING A GREEEN HYDRAULIC SYSTEM FAILURE CLIMBING THROUGH 8000FT. FLIGHT CREW ACCOMPLISHED THE ECAM AND QRH PROCEDURES ALONG WITH A MANUAL GEAR EXTENSION. THE AIRCRAFT LANDED SAFELY AT MIA AND TAXIED TO THE GATE UNDER ITS OWN POWER. MAINTENANCE FOUND THE ELBOW ON THE HYDRAULIC LIN IN THE LEFT PYLON LEAKING AND REPLACED IT PER ECO 2922E003-003. A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED.