Train prep: 3508 BCU release fault ~~~~~ #3508 when put to coast FC-308 shown stuck brake.Replace ACU and function check ok.Brake cycle test are ok.Depot shunting monitoring no stuck brake. ACU:- New s/n: 1044031 Old s/n: 1249046 Not: 2437794 Done by Ngieng/Zul/Morgan/Haikel 21/11/22