Re: Where's the water pump ?
Don't know if it helps...but in my GB it's located in he basement where you fill the water and get to the tanks, back right corner behind a fiberglass panel that you have to remove. It's a pain and you need long arms...on mine anyway.
If you have your numbers on your coach, GB should be able to send you a diagram. They did for me years ago berfore Coachmanbought them out, I would hope that they still would.
BTW, the 1st 2 times that it started to act up...I just took it apart and cleaned it up and it worked again fora couple of years