I'm going to buy a used Pro 3 and since there have been reported some flaws, some of them maybe have been addressed by firmware updates, others seem to be hardware issues which might be there or not. Therefore dear Pro 3'ers, what would you advise me to test before buying a used one? personal buy, not remote. (I don’t mean general things, I mean Pro 3 specific quirks that might be there) Thanks a lot!