Hello Paul83, Welcome to AirForums! We are glad to have you with us.
I have a 2013 25FB. I also had bad smells a few times in my closet area. I replaced the "air admittance valve" that is under the closet floor. After that, I had one more episode of smells, and then it has been good for several years.
In my trailer, the panel that covers the front of the area under the closet is a hinged door, with the hinge on the left. To open you pry it on the right side with a screwdriver or strong fingertips.
Good luck with finding your problem.
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