TC reported intermittent APS fault at front M2 car. TC Aux on at SOM SB - ok. Train performance - ok . Fault recurred intermittently after departing DBG SB.in taken out of service at JUR. Replacement train from UPD.  ~~~~~ 2611 TC reported intermittent APS fault. TC Aux on at SOM SB - ok. Train performance - ok. Fault recurred intermittently after departing DBG SB. Train taken out of service at JUR. Replacement train from UPD. CE reported: 611/612 tc report intermittent APS faults Monitored fews stn No Recurrence of faults Train performance ok  2612 A/C 1-1 Comp Motor U/V/W shorted to G. Isolate unit, insulate & tagged. TIMs shows APS inverter over current, FC 414 & 408. Notification 2542402 raised for CCU C/O. Huzzaidi/Zul/Haiqal/Farid/Koon 45244