I found my low point drains on my 2018 2401RS to be located in the cover that opens to allow access to the fresh water tank drain. There was a black and white hose with twist off fittings that I saw a post about several weeks ago and found them after I had winterized. I didn't get much out of them, but did get a little of the pink stuff whe nI took the covers off.
Also for the hot water tank bypass, one of the valves is well up above the panel removed to access it. I finally found it after running antifreeze out the heater as I had the drain plug removed at the time. I knew there should be three valves to reset, but gave up initially after only resetting two of them (though I knew better and wondered why the pump kept pumping