TC reported power fault at rear m2 car.DC BSD authorised TC to operate UCOS. TIMS showed BCU fault at car 3709 no #2 set. Train performance - ok. TC reported p ower fault at rear m2 car. DC BSD authorised TC to operate U ~~~~~ T258 3710 TC reported power fault at rear m2 car. DC BSD authorised TC to operate UCOS. TIMS showed BCU fault at car 3709 no #2 set. Train performance - ok. Reported at BSD RT3 CE:Unable to board  2709 Found Axle 4 speed sensor not fully intact due to female cannon plug having scoring mark. Swap axle 4 speed sensor to axle 1.    Check inverter 1 and 2, BCH check ok. 3709 no observe BCU fault. Limited movement powering ok. No fault occurred. Depot shunting ok. Done by koh, Firdaus/Sanip 45489