I think all the Gateway's are basically all the same since bathroom is in same place...there is a 1' x 1' access door if you look at the aft basement storage area. Although, during our PDI the service tech said it was actually easier to just remove the 4 screws holding the side cover just inside the off-door compartme, that way you didn't have to crawl into the basement. I tried it both ways and the tech was correct...much easier to just take the side cover off!