I'm not so sure the furnace goes in as a compete unit - mine was screwed to the floor from inside the tan box - there was no way it could have been installed as a complete unit.
I was able to remove my furnace and leave the case in place. There were two screws at the bottom that held the innards in place and the screws that held the exterior vents in place, as well as a wiring harness and the gas line.
The gas line entered at the lower right side and the way it was plumbed it was going to be a major operation to get it undone. I took a shortcut and using tin snips took out a 1" piece of cabinet that blocked the valve from sliding out.
With all the above disconnected, it was a matter of grabbing the guts of the furnace and with a mighty tug it came right out.
Everything I read gave me a 90% probability that it was the circuit board - fortunately, my local dealer had a board tester and was able to confirm my board was good before I shelled out $125 for a new one. It turned out it was my gas valve that was bad - it was easy to replace and once reinstalled the furnace was good as new.
ALANSD - as you are just down the road from me, I would suggest Three Way Campers in Kennesaw for parts - they are a former Airstream dealer and still stock lots of parts - they had everything I needed in stock and their prices were as good as anything I found online. Plus they tested the circuit board for free. If you need a hand, give me a call and I will bring my tin snips!
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