TC reported to DC that train experienceNo Forward Movement. TC changed end and proceeded back to Tr ack 68. 04 launching trains in the rear (T313, T314, T315 an d T316) were affected. ~~~~~ TRAIN U BLE TO MOVE FORWARD/REVERSE. NO FAULT FOUND AT TIMS BUT EVENT RECORDER STATED NO POWERING COMMAND. FOUND STBR ENERGISED WHEN PUT TO COAST. BRER NOT ENERGISED. UNCOUPLED EMU, FOUND 518 U BLE TO    MOVE. #1518 ABRRI NOT ENERGISED. C/O ABRRI, FAULT STILL OCCURS. SWAPPED BCU FROM #1518 TO #2158, FAULT TRANSFERED. C/O BCU DONE, OK. FUNCTION CHECKED, 518 ABLE TO MOVE, STBR NOT ENERGISED. COUPLED BACK & PERFORMED LIMITED MOVEMENT ON BOTH DT DONE, OK.IBRAHIM/SHAHRIE/BUDI MAN/ZOHRI,04/09/20 #2518 BCU S/N OLD: 1820025 NEW: 1815131