How to replace thermal fuse/flame sensor

Question

I was reheating food in our microwave this afternoon and it caught fire. The microwave shut off and now there is no power to the microwave. I assume after a little research that I need to replace the thermal fuse/flame sensor (is this the same thing?). However, I don't know where that is located. It is a Kenmore 721.80603. I went to the Sears website as directed but they did not have an exploded view diagram of this particular model. Can anyone help? Is this something we could do ourselves? Thank you.