Lewis, that door was originally used as an outside shower door. It still says something about water on the inside, center. I got one when I installed a second sewer hose compartment in our 2007 3400RL (like yours) several years ago.
And I bought another through a Montana dealer last Spring when the door flap apparently came loose and broke off in the wind while tooling down the road.
Both sides now have the doors installed upside down, hopefully to avoid a repeat of a missing door should they come loose. No guarantees that would work but it seems to make sense it might help.
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