The cavity light is off as well, the panel board is off, and the night light doesn't come on either.
8 years old. We have had the door switch replaced three times. The last time I had the tech order me spare parts. I have three extra switches-part number #'s WB24X10112, two switch part #'s WB24X10113, and the part that was replaced three times was part #WB24X10029. The problem I know at least on one of those service calls was that it appeared to be working but the microwave part was working-it wouldn't heat up a cup of water.
When you say you have "looked" at it what do you mean. Do you mean you have repaired this same oven with the same symptoms and you have found this to be the problem? Do you know how much the part typically runs and is it fairly easy to replace?
Wow, that is a lot of money for a part. Are you very certain that is the only thing it can be? I hate to invest that in a part only to find out it wasn't the problem. Will this require taking the oven down from the wall or can it be accessed from the control panel?