I just came in from looking for something the guests may have shut off. I also emptied the P-trap in the kitchen sink. Wouldn't this allow the grey tank to vent if the main vent was plugged? There is a foot of 3 inch ABS from the tank to the valve. It's not plugged and the valve is open, my wire goes into the tank at least. Sure has me baffled. Im going back out and look some more.
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