Title and presumption:
"Juror 52: Does Chauvin Have A New Challenge Over Juror Brandon Mitchell?"
He may be able to get an appeal up-and-going, but I predict it will fail at the state supreme court level.
Although I don't live there, I sense that the supreme court of Minnesota is overwhelmingly liberal (perhaps even more than just "liberal", but "politically motivated" as well), and IS NOT going to give Chauvin's appeal a fair hearing.