At the DCO tech day (Sean Lowe hosted) today we took the door apart.
I found two nuts and a washer in the bottom of the door. There was a missing bolt and nut that holds the window regulator to a bracket in the door. The top black plate below the drop glass had a bunch of loose screws.... After I went through all of the bolts and screws and tightened them up (also did the clear plastic hose over rods where they hit metal parts, thanks!), no more squeaks and rattles!
Thanks!!