Train encountered power fault at rear M2car while arriving station. Reset at SIM1 - ok.Fault recu rred while departing SIM1. Unable to reset at TAM1. Fault pe rsisted at PSR2. Reset at PSR2 - ok. Fault recurred when dep ~~~~~ 2508 found TM4 motor shorted. M35(U)/M36(V)/M37(W) meggar to earth '0'. #2508 PRCB isolated & tagged. NOtif 2244950 raised to RSW to C/O. Name                          : Au Tuck Kim Date of Occurrence            : 02/02/2021 EMU / Equipment / Location    : 2508/Traction Motor/#4 unit Description of fault / cause  : 2508 TM-4  shorted to ground.                                    PRCB isolated.  Chan SW/Hanafi. 03/02/2021.