I called Jayco Customer Service. Anthony sent me a copy of the schematics for the TT. Though there were a few errors I was able to finally determine what I had previously suspected - the drain valves were located under the shower floor. I extended the front slide and there was a small panel but no screws. There was a small gap along the top in the center so stuck my pocketknife blade in and applied some pressure slowly and it gave enough for me to see that it was a top slide down panel door. I slide the door up and out of the way and bingo - there they were.
I sent Anthony an email recommending that Jayco put one of the famous stickers on the panel for future owners.
I may go ahead and attach an inline valve to the hoses under the trailer for easier use since I winter camp, going South for a couple of weeks and returning North. I like to drain my tanks and blow out the lines as I leave warm weather and they will definitely make it easier.
Another DIY project completed - Thanks for the input.