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We have a 3400RL, and as Brad said, it is behind the basement cover. Open the barn doors on the street side, and while looking in, move your eyes to the right. Here, you will find a "wall". This wall is actually just a 1/4 inch piece of paneling. Look for the black screw handles - turn these and you can remove the paneling and you will see the furnace.
The cross bracing really helped. Before removing the furnace to replace the circuit board, we didn't have any noise. I had to remove the furnace (cutting the 12v wires and disconnecting the propane) to replace the circuit board and replace the ignitor. What a pain in a 2006 3400! Like many other posters in this thread, I am NOT amenable to anticipating the heat up and cool down thumps in the furnace, especially when trying to sleep.
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