ok. So packing was replaced in the stuffing box. My ex-,mechanic only hand tightened it, so a huge flood of water filled the Blige on our first trip this season. That's another story though. Lesson: make sure you really trust your mechanic and/or always double check your mechanic's work!
That didn't fix the problem though. It turned out we had a leaking macerator pump so blackwater was seeping into the bilge. We sail on the Great Lakes so the pump isn't used, but it's on the bottom of the tank so the leak was a pretty serious issue.
Pump replaced, bilge cleaned, and leak has stopped. Problem solved. thanks everyone.