Update:
Since I'm still waiting on the 240p test suite cart and component cables for my Genesis to show up, I decided to hook up the Wii today and take a few more pics.
https://ibb.co/xLPC9bZ
https://ibb.co/gRG4zqp
https://ibb.co/bJ6mcqF
https://ibb.co/zZsV4Fv
https://ibb.co/Rbf6sxt
That test screen that's supposed to be solid white seems very off.
I went back through the service manual and did a little bit of experimentation with some of the settings in the service menu. I didn't commit any of the changes because none of them really seemed to help with that bow in the middle of the screen at the top.
I rotated the TV in place and ran a couple cold power cycles. After I first moved it, I turned it on to the tuner and in the static there were noticeable colors in the corners. After another power cycle, they were gone.
After a more thorough check of the back of the tube and around the chassis, I determined that there didn't seem to be any dislodged magnets.
I have some sheets of magnet material for making fridge magnets. I wonder if that would be sufficient to make some adjustments on this tv.