Train stopped with stuck brake indication at car 3641 before CCK SB. STBS operated. Pax disembarked at CCK. ~~~~~ 3641 ER D/L - Done. Replaced ACU on 3641 & swopped BCU from 3641 to 1641. Brake pressure test - OK. 3641 ACU S/N : OLD : 1516-046. NEW : 1543-082.  Selvan/Lee PT. 02/06/2020.