WG 4606 high pitched sound

[Scottacus]

I turned on my Gorf game earlier today and the WG 4606 had a great picture but made a high pitched sound while it was running.  This is the first time it did anything like this and I let the game run for about a half hour before turning it off.   I restarted the game after about 10 minutes or so it did not make the same sound again  Any ideas as to what this was?

[Scottacus]

Here is a link to a recording that I made from just below the monitor inside the cab.  Because the sound is so high pitched, it is hard to tell exactly where it is coming from.

https://drive.google.com/file/d/0BxG5uAhqDuKIdnA1YnA1aldsSjg/view?usp=sharing

The sound is not as loud as the recording makes it because I used a high quality condenser mic that was set fairly hot.

[Scottacus]

My guess is that this high frequency sound is being caused by the Flyback Transformer, is this right and if so is there a fix short of replacing it?

Here are a couple of screen shots of the frequency of these signals in case that helps anyone figure out what is generating them.



There are a couple of smaller spikes at a lower frequency.