I have a 2018 Vegas 25.6. I discovered that the “funky” part of the rear wall, under the drawers, that looks sort of like a magazine rack, is held in place by 2 screws. If you look “inside” the rack along the left and right sides you should see the screw heads. Remove these screws and you can pull the “rack” forward. The slide does need to be open. Once removed you can see the fresh water holding tank and the pump behind it. I didn’t need to access the pump, so I don’t know if you have to remove the fresh water tank or not.
Hope this helps. If you need, I can get you some pics of where I found the screws on my unit.
Good luck.
Mike
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