Well, at about 2 AM we woke up to an awful "ozone" electrical burning smell. We could not locate the source. The smell returned at about 0900. Again, we could not find the source. We thought maybe the electric WH. Since we were leaving soon and the weather was fair, we just unplugged. When we got home, we did not plug back in.
Well, after some searching we found this:
and this:
It is in the shop now for replacing.