There was a quick light show inside the microwave today. It appears there was some arcing to the door:
Microwave Door Arcing.jpg
It was shut off immediately, cleaned and tried quickly again. Seemed to be okay, but it is hard to trust after the panic.
The total length of the area shown is about 51mm or 2".
The two dots in the center have been there for quite a while. The marks on either side are new.
Is there a fix for this or is it time to purchase a new microwave?
This thing isn't much more than 5 years old.
jtk