Pax feedback to Staff(BBT) T406 was jerky.TC checked and confirmed no abnormalities, performance wasnormal. Staff(YWT) checked for all 6 cars for jerky motion and confirmed no abnormalities found. ~~~~~ 3689 Pax feedback to Staff(BBT) T406 was jerky.TC checked and confirmed no abnormalities, performance was normal. Staff(YWT) checked for all 6 cars for jerky motion and confirmed no abnormalities found. CE : Checked all 6 cars no jerky n no abnormalities found.  Check and found 1689 BCP at B1, B2 pressure higher compare with    other car. Swap CP, AS Pressure Transmitter to no avail. Swap BCU to 2689 fault transfer. Replace BCU, WDC setting and brake cyclic test ok. BCP Pressure ok. KSF B BCU old:1830125  new:1847411 notif rsw:2338078 Done by Zulq/Saini/Asruddin 44535