These are, in fact, socketed ICs so they are easy to remove. I also removed, cleaned and re-seated the RIOT and TIA, but no change.
I broke out some earlier Atari games as recommended
In combat all of the playfields seemed correct but the tank’s positions randomly changed and the blue tank spun around at the left side of the field.
Space Invaders looks almost perfect, though vertical lines appeared sometimes. Bullets also seemed misplaced.
Super Breakout has some misplacement as well.
If this is still looking to be a bad TIA then I’m going to order a replacement. I’ll post in “Wanted” like @RamrodHare mentioned, but I’ll get one from Best Electronics if I don’t get a hit after awhile.