I've managed to damage my UM4.6k PL beyond repair (BMD thinks it's too expensive to repair, and is cheaper to replace).

However, the camera is mostly is good condition. It still turns on and functions to some extent. I've stripped it down and it actual looks to be quite simple to change parts on. Well, just whole parts (entire PCB etc). I'm looking for another UM4.6k that may not be working, to then swop out parts to see if I can get a single working camera. More an experiment than a scientific technical endeavour.