EMU 655/656 During DT found #2655 BCU fa ~~~~~ 2655 During DT found BCU fault (FC 330, 308, 331, 329,328).  2655 ER D/L & found FC 328/329/331/332/308.    Brake pressure from B3 to EM unable to achieve. Replaced ACU & function check - OK. Brake pressure cyclic test - OK. Limited movement/depot shunting - OK. No leak found. #2655 ACU S/N : OLD : 1539/171 RF  : 1902/632 RC  : 1902/553 AF  : 2005/190 EM  : 1650/597 AC  : 2005/409 All S/V mode 4 NEW : 1538/159 RF  : 1749/252 (mode 3) RC  : 1749/437 (mode 3) AF  : 2018/469 (mode 4) EM  : 1745/311 (mode 3) AC  : 2018/402 (mode 4)  Sarma/Anand 44157