A lazy Sunday, so I decided to go in and replace those caps.
After that was done, I started to reassemble the set, and noticed a control that I'd missed before, because it was half-covered with a sticker.
"HORIZONTAL LINEARITY". Well son of a gun!
Powered up the set, and went to adjust it when I realized that the adjusting screw that would be IN the pot, is missing!
I have absolutely no idea how it's locking in at ALL, given that. The pot itself is slightly askew, so I'm gonna be posting in the classifieds for a horizontal linearity control, unless someone happens to read this post, and has one to spare.
I sit here scratching my head as to how it's even working, and how I missed this before!