2014 Wind River 250RDSW in the driveway!!!

We bought a 25 ft Windriver this year and so far very happy with it. We did have the same problem with the black tank valve not closing all the way . We called and took it to our local RV dealer for repairs. Turns out it was debris from when they cut the hole in the tank to add the drain pipe. The tech found the plastic circle they cut out as well as all the saw shavings in the tank ,which got caught in the vale guide not allowing it to close tight. They cleaned it all out and installed a new valve (supplied by Outdoors RV) and it works fine. I later called Outdoors Rv and told them that they could have saved themselves over $300 in repair cost ,by using a shop vac for 5 minutes.