Hi Stmbtwill. Sorry you’re having these issues.
Just a recommendation, in case you didn’t do this:
Schedule another service appointment. When you bring the vehicle in, ask the Service Advisor to take a drive with you. You drive.
Drive the vehicle in a way that causes the groan to occur. You know the conditions better than they do.
When it occurs, ask the SA if they hear it. Keep driving until they clearly admit/state they hear it. Once that occurs, they heard it and it is verified.
This will help avoid the dreaded “Could not duplicate the customer concern” diagnosis.
Otherwise, we are leaving it up to a Tech to drive the vehicle in a manner that duplicates our driving, in order to hear a noise. And that often does not happen.
So instead, we should personally demonstrate it.
Keep us updated and good luck.