I rec'd a service bulletin today from Tiffin. Seems they mis-installed the water filter housing.
The red button that relieves the pressure is supposed to be on the left. As you can see from mine (shown below), the red button is on the right.
They also sent instructions on how to flip it around (if you don't want to take it to a dealer to fix). Seems pretty straight forward, I think I could do it. You'll need to call Tiffin's warranty dept. to get replacement hose clamps before you start.