You and I both wish you were my plumber. Do you install anaerobic sceptic systems? If so, you might want to come to Rockwall (East side of Dallas). That job would be big enough to make it worth...
I'm not aware of any other drains being backed up and I have shut off all usage of water in this wing to make troubleshooting easier. I even checked the two toilets to ensure no leakage around the...