What was found
DURING CRUISE, AT FL300 AN ECAM MESSAGE FOR HYD GREEN RESERVIOR LOW LEVEL. FOLLOWED ECAM AND OFF PUMPS. GRAVITY GEAR EXTENTION. FOUND "AN"PLUG AT GREEN SYSTEM ISOLATION COCK IN MLG WHEEL LOOSE. SECURED THE A. N. PLUG, AND LEAK CHECKED GOOD. OPS CHECKED GOOD IAW AMM 27-14-21-0401