Spent the day relaxing by reading through the manuals.
Also, found the plumbing diagram on the Winnebago website. According to the drawings, the stuff flushes down, exit to the upper right, goes through a trap, makes two left hand ninety-degree turns and dumps into the lowest level of the tank. Currently have the tank filled to one-third. Will add dish soap tomorrow, another third and slosh it home to the KOA in my home town for dumping.
The fridge may work on AC, albeit not as efficient as LP. Further testing required without tomorrow's breakfast at risk of rotting into an unhealthy event.
Once home, need to service the batteries and the inconveniently located fuel/water separator - that may cure the CEL. There will have to a day trip to test.
Thank you each for your comments & compliments. I write as a way to find my right or best answers.
wa8xym de k1bs - 73. Do you use 2M while on the road? Someday soon, I need to install my VHF rig and an antenna.
Cheers, Bob