Hornby Class 142 Pacer: Repair Request

I got sent this Hornby Class 142 Pacer by a chap called Stephen as it wasn't running at all well. This is a later model than my own Pacer and configured differently. It was interesting to see the difference but I'm not sure it's really any better. FAQ - https://ko-fi.com/post/FAQ-C0C6E0UO4 Support - https://ko-fi.com/00bill73561