Is it star button or speaker on the top? next to the injection button? and how did it happen? Also, do you have vcds or similar tool to check can connection? It uses different can connection and for example if you have polar fis or other thing that uses the same can connection line and if you unplug it, the cans will not work, illumination aswell. Secondly, can controller is the part of the main board, but I haven't seen any unit that would die naturally, it is possible after accident or water damage. The main board is around 200 plus labour.
If you are near leeds, I could put the unit on the desk and using special software do the diagnostic, check illumination etc.