OK based on both of your answers, it seems like I'm going to have to dismantle the bed platform to get to this thing. That's definitely where the noise comes from when I run the water pump. So I'm guessing that those lines I see coming out the bottom are just the end of the drain, like you said. Ugh...I've got to come up with a better way. I've got a regular size queen size mattress in there that isn't easy to move in a tiny room, and then a plywood panel with a million screws in it and no access panel that I can see...thanks guys