I have the Bernina 830 and I’ve had it for 9 years. It cost me a small fortune and I would throw a fit if it needed a new mother board now. It’s waiting for me to take it to be serviced. The bobbin thread wound itself around the outside and inside of the bobbin and, try as I might, I can’t get it all out. I’ve been using my Viking Huskavarna Quilt Designer, but it’s not the same. And I have to travel three hours to take the Bernina to the dealer. Sorry about your Bernina. I’d cause a stink and try to get something done within reason that you can afford.