What was found
AIRCRAFT WAS GROUNDED: AT CRUISE ALTTITUDE FL 360, HYDRAULIC SYSTEM B FAILED, HYDRAULIC QUANTITY AND PRESSURE INDICATED 0. AN EMEREGENCY WAS DECLARED AND THE AIRCRAFT RETURNED TO MIA WHERE IT LANDED SAFELY WITHOUT FURTHER INCIDENT. MAINTENANCE FOUND THE B SYSTEM HYDRAULIC PRESSURE MODULE LEAKING FLUID FROM THE INBOARD PLUG AND REPLACED THE O-RING WHICH WAS DAMAGED. THE HYDRAULIC SYSTEM WAS SERVICED AND A SATISFACTORY LEAK AN OPERATIONAL CHECK WAS ACCOMPLISHED PER AMM 29-11-71.