Tandem is a 2006 Cannondale with disc brakes. LBS took the rear hub apart and cleaned it up, lubricated. Mechanic said it was pretty dirty. Rear disc brakes were also readjusted. Mech is working on obtaining bearings for the hub.
Rode it for 26 miles, no sounds or rubbing. Issue is definitely in the rear hub area so thank you for the direction on that, wish I had posted that video a long time ago so I could have saved a lot of money. On the flip side I basically have a brand new bike.