Train encountered power fault at Rear M2car while departing from UPD TB2. Reset at Signal W2004 - o k. Fault recurred arriving JUR MT & BBT SB for Rear M2 car. Reset - ok. TC feedback train performance- ok. ~~~~~ To be follow up BCH c/o Check and found FC-108/110/137,Further check found BCH1 IGBT faulty.Notification 2454263 raise to HM support to replace VVVF box from 703/704 cannibalised spare. Done by Sanip/Koh/Rizman.  17/01/23 Train encountered power fault at Rear M2     Check Tims FC-108/110/137/820/821.Further check pre-charging resistor ok.L2 contactor found contact tip condition no good-c/o ok.K1 wiring loose thighten ok.Inv1 & 2 resistance check ok.BCH found 1 side IGBT resistance NG,but no sign of burning or flash over.0020 raise to follow up BCH c/o. Done by Sanip/Koh. 16/01/23