2558 - BCU Fault. To check & rectify. (T ~~~~~ 2558 - BCU Fault.(Train Prep)  2558 found FC 308/330/331). ER showed #2558 BCP stuck at EM. Swapped #2557 ACU to #2558. Replaced #2557 ACU with new spare. Monitor for 3 hour & during shunting, no brake fault occurred.  Lee PT/Shafie 44959 ACU S/N (after swapped) : #2557 - 1024/033 #2558 - 1301/120 #2557 faulty ACU S/N : 1047/079