I found this machine totally dead. As expected after reading a bit here, I found an open thermal fuse.

But I also found extensive arcing and burning on the bottom of the board near the power relays. There is literally a trench about an inch long burnt into the board material. Pretty spectacular and potentially dangerous failure....

I'm wondering, should I decide to replace the board and fuse, what's the likelihood of the machine working? And how common is this? Have any design defects been corrected?

Thanks for any guidance.

Alan