What was found
AS THE AIRCRAFT WAS TAXING OUT FOR DEPARTURE THE LEFT HYDRAULIC SYSTEM LOST ALL FLUID AND PRESSURE. THE AIRCRAFT RETURNED TO THE GATE WITHOUT ANY FURTHER PROBLEMS. MAINTENANCE FOUND THE LEFT MAIN LANDING GEAR BOTTOM BRAKE FUSE "CAME APART" AND THE LEFT HYDRAULIC SYSTEM RESERVOIR WAS EMPTY. THE NR 1 ENGINE DRIVEN HYDRAULIC PUMP AND FILTERS WERE REPLACED. LEAK CHECK AND OPERATIONAL CHECK WERE GOOD AND THE AIRCRAFT WAS RETURNED TO SERVICE.