Q: Have sewer smell coming back into the home, What to do?

Sewer smell coming out of roof vent from laboratories in Master bath, filtering back into the home. Sinks draining fine, have used Thrift drain cleaner which is best cleaning pipes, no smell coming from sinks, only out the roof vent, finding it's way back into the home. What to Do?! Someone suggested RotoRooter. Any ideas? Tks!

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