Tswiii- before I traded I my popup, I had a similar water leak. As stated above, pull up the dinette cushions and there should be a board with a hole in it- pull up that board by using the hole. Sometime the water lines rub against the wood as the slide out moves in and out or a clamp might be weak. All speculation right now. I traded my unit into Johnny walker's on boulder at flamingo- if you need to take it for service ask for Ed. My unit (TT) is there now for warranty work. If you are still having trouble locating the leak, send me a private message as I may be in Henderson on Saturday afternoon- could give a hand locating/reparing/giving opinion.
2014 Stealth Evo 2850- "Woodstock"
2011 Toyota Tundra Rock Crawler TRD 5.7- "Clifford"
2013 Honda Accord Coupe V6 w/Track Pack- "Julia"
Just glad to get away