Actually, after I took off the cover, I found that I didn't have to do so. The thermoprotector is only accessible by unscrewing one screw at the top of the control panel, and then the whole assembly slides up and off. You can't get to it from the side.
In fact, there are two almost identical thermoprotectors mounted side by side screwed into the front bottom of the chassis. I saw a 2" white cylindrical fuse holder mid-cavity, but didn't see any second TP on top of the microwave cavity.
I took both out, but upon closer inspection, the one on the left had wider electrical contact blades, unlike the part I had, which had the same blade dimensions as the one on the right.
So I switched out the one on the right, put back the control panel, plugged it in and everything worked!
This model seems to be different than the one you thought I had, but without taking off the cover as you explained I wouldn't have figured out what I did.
I can't give you an excellent rating, but at least you got me in the ballpark, and my information from Magic Chef tech line got me the rest of the way.