I need a new Motherboard for my MC4000. Where can...

Question

My MC4000 showed "Overload" on the screen. I cleaned and oiled it, and it still would not work. I took it to a repairman, and he said it needed a new motherboard. Do you know if it is possible to get a Motherboard for a Janome MC4000? Please let me know where to find one. Thanks