Train encountered power fault at car 2551 while arriving station. Reset at CCK1 - ok. Fault recurredarriving BGB1. Reset at BGB1 - unable to reset. ~~~~~ Train encountered power fault at car 255     #2551 Fault code 108/140/820/821.Conduct propulsion static test ok.LB2 operation ok.Check CCD fuse ok.Check INV1,INV2,BCH ,BRC-OK.Charging resistor ok.Check L1,L2,K coil ok.L1,L2,K contact found condition-replace contacts.L2 found wire not fully in,re-insert wire.Swap relay unit 2551/1551.Conduct proplusion static test ok.Limited movement powering ok.    Done by Zulq/Asruddin.  19/08/21