I was also advised 023 will be going back to Loughborough. Also, whilst the issue could continue in 1000 if they are to use the same radiator and cooler group set up, this is the time to design the issues out if they are, if not then the issue with 023 is largely irrelevant.
10000 is using the frames, cooler group, and various other bits from 58022.
The bogies and traction motors come from a 77, and I believe it is to use an alternator and rectifier from a 56.
The bodywork will be built from scratch.
The only authentic part will be the engine - one of the same batch the original pair came from. It, like most of the batch, was used as a standby generator (at a hospital or other place that needs a backup if the mains supply fails) Such generatirs are good value secondhand, having been barely used but maintained to a high standard (because you rarely need them, but when you do, you REALLY need them!)