You all are correct, the vent was clogged. I had faulty duckbill valves (which I replaced) I think the Vacuflush system was actually bypassing the outlet DB valves and pressurizing the entire holding tank.
I tried to backflush through the vent line to no effect, so I bent a little hook into the end of a piece of 80 lb test wire leader and scraped around into the vent. Got an instant hiss and a nice odor.
All is working well now, and no more smell.
Thanks for the help.
Doug
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