My unit died a sad death caused by overheating (why did apply not provide a simple on/off switch to these units?)
So, I have a gutted unit minus motherboard / logic board.
If anyone reading this has a unit that has a working motherboard, but dead in other ways please get in contact with me. I’d be interested.
** Going to Apple Store tomorrow to price up a replacement, but suspect second hand will be a great deal cheaper!