175102 has been taken out of service at Chester bound for Manchester.
No replacement organised, the guard just refuses to have the train in use because of a door fault (believe that's what I heard).

EDIT: A door is shutting on its own. If a person was to get trapped in it and injure themselves, it is the guard that would get into trouble.
Fitters are coming now to see the train. If they can't fix it, no replacement will be organised.