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Bear,
When you say your 'sink vent' is overflowing... do you mean water comes up into your sink bowl when your dishwasher is draining or do you have pipe/vent somewhere else that you are referring to?
If you you have a two bowl sink and the water is coming up in the first one (with the disposal and dishwasher connected below it) then you have a blockage on the drain side of the disposal. If it backs up into both sink bowls then the blockage is in the p-trap or downstream from that.
If you have further info, or I misunderstood you problem please let us know.
Good luck, Jim
'Just a handyman trying to help'
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