Sorry, i forgot about the pricing issue - just trying to illustrate why I needed another opinion. The second contractor was shocked at the price I was quoted and was going to replace the exchanger for half the price. When he saw it wasn't cracked (which still remains a mystery), he charged me even less for the work. I put a call into our gas company to see if I could have someone impartial look at this. I am not trying to be cheap here, but believe me, this is a ton of money and I am running out! I also want to be safe!
Our real estate agent just called and the buyers are ok with the just the stuff fixed that I mentioned before - apparently the same thing happened to them on the house they just sold. I am amazed and confused!!