If it is powered all the time, does that mean it is likely the new circuit board is bad? Would that explain why after replacing the circuit board the wax motor goes bad and therefore causes the thermal fuse to blow?

I left the new circuit board in because, I did not think I could return it since it is electrical and plugged in. But, I am not certain that had anything to do with the original problem because I could not get it to work until I disconnected the wiring harness, cleaned the connections, and put it back.

Or could is it likely the failing wax motor was the original cause. I know you can not give a definitive answer, but if you were guessing.

I got the vent, but the fuse is shipping separately. How do you get out the old vent? It is all plastic and I did not want to break it. Do you twist, pry, or is there a tab to get the vent and the vent deflector to separate? The deflector has a small horizontal slot at the 6:00 position. Do you force something in there to pry it open?