Actually I'm surprised it hasn't tipped off the curb from that first pic.
Those are the easiest switches to change out! Unreal how lazy some people can be!
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You could Red Tag That unit Hear for Jumperd out saftey switch and un painted gas pipe.
So did you fix em up?
How old is the unit? It looks quite old.
Bet my next paycheck that hx is full of holes. Flames rolling out tripping the bypassed limits.
Heat inspection? Just remove the 20 screws holding the side discharge cover on.
That style notorious for holes in hx after 6yrs..replaced alot last heating season
I'd quote to replace those units. They're 119 in dog years.