What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED INBOUND INTO SYR DUE TO THE FLIGHT CREW REPORTING THAT UPON GEAR EXTENSION ON APPROACH A GREEN HYDRAULIC SYSTEM RESERVOIR LOW LEVEL MESSAGE DISPLAYED, FLIGHT CREW ACCOMPLISHED ECAM PROCEDURES AND LANDED SAFELY AT SYR WHERE THE AIRCRAFT WAS TOWED TO THE GATE DUE TO THE LOSS OF NOSE WHEEL STEERING. IT WAS REPORTED THAT THE BOTTOM OF AIRCRAFT WAS COVERED IN HYDRAULIC FLUID. MAINTENANCE FOUND LEFT HAND MAIN LANDING GEAR DOOR ACTUATOR SWIVEL JOINT FITTING BROKEN AND REPLACED IT PER AMM 32-31-38. A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED.