The dealer installed a cyclone vent cap and the base pressure in the black water tank is with the vent cap on. I don't understand why a black water tank would be pressurized going down the road except it is located in the downward force area right behind one of the roof vent covers.
The factory basically told me to dump tanks and apparently not use them on the road. Also, the work was done partially at a dealer that wanted to replumb the sink but was told no by Thor and then Thor took possession of the coach without my consent and declared it not a problem. Now the front heater doesn't work. They had to pull a new HDMI cable as the TV never worked ever!
Thanks again for the suggestions.
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