Vanguard sound issue. - white noise

Teknotoyz

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Has anyone had a Vanguard that has had a static noise issue? The game plays fine, all sounds and voice is there. But it has a constant rumble/white noise that actually isn't noticeable while playing. It IS extremely annoying while the machine is in attract mode.

I noticed the sound amp section does have 5-6 capacitors, has anyone that has had this issue tried changing those? I have 2 boardsets, 1 even non-working, that make this sound. I checked wiring and swapped power supplies with no improvement.
 
Has anyone ever tried using an O-scope to trace audio noise into a board?
I'm not sure if the amp is causing the noise or if the line level signal is corrupt.
 
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