Happ Vision Pro is suddenly blurry

MaximRecoil

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I bought this monitor new in 2009 and this is the first issue I've ever had with it. I bought two other identical monitors at around the same time, and still no issues yet with either one of those.

I turned my Missile Command on for the first time in several months, and the monitor came up blurry; not extremely blurry, but rather, it looks like what would happen if you turned the flyback focus pot a 16th of an inch to the left or right on a monitor that was originally in perfect focus.

I suspect that I can fix it (temporarily at least) by adjusting the focus pot, but there must be some underlying problem which caused it, because it didn't gradually get out of focus from extensive use; in fact, this monitor hasn't been used much at all. It's been used for maybe a few hours every few months (if that) since I bought it new. The last time I used it it was in perfect focus like it had always been.

Is there a particular capacitor or other type of component that can fail and cause the focus to change? Or maybe the flyback transformer itself?
 
Its usually the flyback

It looks like flyback transformers are available at least.

I adjusted the focus pot slightly clockwise which brought it back into focus, but after about 10 minutes, it was out of focus again. Then I adjusted it counterclockwise back to about where it originally was, which brought it into focus again, and so far it has stayed in focus. So maybe a bad connection developed within the pot, and just turning it a bit cleaned it up.
 
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