Train encountered power fault at Front M2 car while departing station. Reset at BSH BDL & TAP but tono avail. ~~~~~ Train encountered power fault at 2637 car while departing station. Reset at BSH BDL & TAP but to no avail.  FC108, 137, 820, 821. Further check found BCH 1 wire GBT1N and    GBT1P measure IGBT shorted. INV1 and 2 checked ok. Line breaker contact tip checked ok. Pre-charging resistor checked ok. CCD fuse and shoes checked ok. MSB handle set to cut off and PRCB tripped to follow up BCH c/o. Notification to HM for BCH c/o: 2598018 Done by: Rizman/Koh/Jack 10.5.24 To change out BCH, propulsion control unit and conduct powering test after BCH c/o  VVVF controller changed out preventively due to previous swapping history. 2637 BCH replaced. Gate test INV1, INV2, BCH ok. Propulsion no power test ok. Limited movement checked powering gate 'ON' ok. Side finding. #3637 ACU AC solenoid valve heavy air leak, changed out and function test ok. 2637 BCH Old S/N: 319RB0-4H New S/N: 607RB0-2H Notif: 2598252 2637 VVVF controller Old S/N: 319RB0-2H New S/N: 566RB0-1H Notif: 2598324 3637 ACU Old S/N: 1547 090 New S/N: 1439010 Notif: 2598292 Done by: Jack/Koh/Rizman/Sanip 45425