I too do not have the 23F, but all the tt's are fairly simular.
For the water heater, the valves usually are right behind it. So locate it outside, then go inside to that spot. They always need a #2 square drive screw drive to access the area. Depending on your configuration, you can access it from above if it is hidden in a dinnette area, or you need to open a false panel front. In my case, it is in my dinnette booth, so I remove a cushion remove one screw, which never got reinstalled, so I now have easy access any time.
The regular plumbing low point brains are usually under the bathroom sink. Open the lower cabinet door, and reach your hand into the tiny access port, and pull up on the Tee handle valves. I hated that little hand access, so I removed the panel, now I can see what I access doing.
The water pump, is probably sitting on the floor, right below where your gravity fill port is. For me, it's under the frig, behind another cabinet door behind another false panel, that I removed. If you cannot find it, turn on the pump and listen for it. It will be hidden too.
Just an fyi, your water pump and water heat probably will have a three way valves, verses the older tt's that have multiple valves.
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