Cambridge Audio CD6 buzzing

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I have picked up a very nice example of a Cambridge Audio cd6. From time to time the chassis buzzes, not through the speakers just inside itself. I can push down on it and it stops so appears to be a resonation of some kind. I have read somewhere, I think on her that the triple power supplies cause it but I was wondering if anyone here knows of a definite fix.
I have tried earthing the chassis but to no avail, also there is no current leak to the chassis, I have had that before when my inner arm caught the corner there was quite a shock to be had. That cd player has long gone to audio heaven by the way. Thankyou in advance.
 
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