PV rattle typically presents itself at idle and when the revs are dropping to the point of the governer being in its "home" position, with no preload on the system to take the slop out. On a GG motor, they can rattle a lot if they need adjustment, but once adjusted they should stay that way. There is a remote possibility that the bellcrank setscrew has come loose, but I would then also expect you would not have full PV travel and normal operation.
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