THE SERVICE HOIST OPERATOR COULD NOT GET BRAKES TO RELEASE ON THE HOIST. ALL UNDERGROUND EM- PLOYEES EVACUATED THE MINE THROUGH THE 2ND WAY OUT. AFTER INSPECTION, ELECTRICIANS FOUND A BLOWN FUSE IN DYNAPAR BREAK GOVERNOR; FUSE WAS REPLACED AND THE HOIST WAS BACK IN OPERATION AT 7:45 A.M.