Okay, so I've been doing some comparisons between the two consoles, to see what I can do to fix them. I'll just list what I've found here.

I have two units, one I will call stiff (because the switches are stiff) and the other loose (since the switches are.. you know)

So Stiff has the following anomalies:

Anything bright and blue hues will bleed. a lot. a little on the right and a lot on the left. This makes the copyright text on Yar's revenge almost unreadable.

On Centipede's title screen, the Blue section of the centipede (the N) is very blurry. the copyright text and ATARI letters are blurry as well, shifted left.

All reddish hue seems to be fine. There is a little ghosting on bright white (visible in B&W mode on Video pinball). the Purple colors are also "bordered" with ghosting.

The first stage of Jr. Pac Man has a little noise in the olive/brown maze part.

On the right side of the blocks on Super Breakout, there is a little bright white line there.

Loose has this:

Jr. Pac Man stage starts off GREEN! After a few minutes, the colors slowly come back to normal. very strange.

There isn't any fuzz in the signal, that I can see.

Kool-Aid Man does NOT WORK.... Well, it does sometimes, but on occasions it will go mental and not show the score, and the player just bounces all over the walls. Very weird.

There is a little ghosting on greenish hues on this one, some on the blue, but it will go away (!!) after a few minutes.

Most of these issues aren't very critical, other than some of the bleeding, Stiff is in great shape! I would, however, like to remedy some of these things.