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I had a thought that it might be a plug in the vent line somewhere but on second thoughts, if you’re not getting a smell from anywhere else, it may not be that. Just a thought though. I doubt it’s a plugged vent unless the sink would be on its own separate vent to the roof.
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2011 GMC 4X4 dually CC, 6.6 Duramax with Allison Transmission. Formally 2001 Montana,2007 3400RL Montana, presently 2018 3401RS Alpine.
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