It was leaking right where the fresh water tank is to be filled from. Once I noticed that, I closed the city water connection, and just used the fresh water that was in that tank. I'm not sure if the tank was winterized, I purchased this Toyota from a lady up in Atlanta Ga. So, I need to go back to the Toyota and check if something was closed, or a valve was added like in the picture. Also, just before I was going to the dump station, I was trying to empty all the nasty tanks to empty the fresh water tank, and was not keeping my eye on the levels, and that's when I notice the water backing up on the shower floor, any how, after the tanks were emptied out, the shower floor was dry. i do need to go and re-check all of the connections on those pipes and see if anything is not working. thank you all for all the hint and answers, you all are very kind.