I took mine in to the dealership, they called back that afternoon to say it was fixed. When I asked what repairs were made, they said "All I can tell you is magic hands. We tore everything down, didn't find any glaring issue, built it all back up, and the play is no longer there." I wish I knew...
Following along as I've had the same issue...
Here's my experience thus far:
I bought a '19 JLU with 29k mi on it from a [chevy] dealer. During the test drive, I noticed it pulling right...which I just attributed to needing an alignment.
Next day, it went into a death wobble on the interstate...