TIMS showed intermittent brake fault atFDT car. TC confirmed train performance ok. ~~~~~ 3659 TIMS showed intermittent brake fault. TC confirmed train performance ok.  3659 checked Fault Trace & found FC 327 and 323. Checked tachogen 4 - OK. Replaced #3659 BCU & set wheel diameter 819mm.. Limited movement/depot shunting - OK.  Sarma/Kiran 44646 #3659 BCU S/N : OLD : 15-44-300 NEW : 15-21-204