Just bought a RPod 171 late last summer, had a dealer winterize it as it was in their shop for warranty work on the stereo.  So just getting ready to do some camping this summer and proceeded to dewinterize it.  I noticed the fresh water tank is missing its drain plug.  So I hooked up the hose to the side of the unit and turned it on thinking I could flush the system (pressure water).  I soon noticed water (pink) coming out from under the bathroom.  
I guess I cannot do a dewinterizing using pressured water?  Where is the water coming from anyway?  I removed the screen below the bathroom door and could not see where the water was coming from.  
We had a very mild winter and no snow and so I don't think any lines are broken, plus it was winterized by a rpod dealer.
What size of plug goes into to the freshwater tank and when I dewinterize, do I need to take off those low water drains just rear of the tires?
I have read how to dewinterize and there is nothing about using pressured water to do it.  So I guess i screwed up there.
Any help would be appreciated.
Thanks 
Bob