This is an older (5-7 years old?) Panasonic TV (model PV-M2079) used
primarily for GameCube and for the occasional video.

When I bring up the Menu, or any other dialog screen, there is a 1/2"
section of the menu screen at the left side, a 2" vertical section of
black where any of the icons or text are missing, and then the rest of
the screen appears where it normally would. Like someone had cut a
chunk of it out, but the rest remained in place.

When a game or video is being played, the appearance is different.
The picture seems to be pushed 3" to the right, compressed somewhat
so that we're missing about 10% of the right side of the picture. The
3" section on the left isn't blank, it has a kind of ghosted, swirled
portion of the picture.

Any suggestions on what I might look for to repair this?