David is probably correct, there were two locations that were used on the 3400 depending on year. Our 2007 had it located behind the breaker/fuse pane in the compartment over the washer/dryer closet. Some models, and evidently yours, had it located under the steps to the bedroom. It should be accessible by removing the bottom-most step riser with the vents in it. The other way is to access it through the basement, which requires removal of the basement inside wall.
Bingo
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Bingo and Cathy - Our adventures begin in the hills of WV. We are blessed by our 2014 3850FL Big Sky (previous 2011 3750FL and 2007 3400RL) that we pull with a 2007 Chevy Silverado Classic DRW CC dually.
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