Jester, I followed the boxa.net link above and clicked on a bunch of other threads linked in that thread. Found this:
"Porsche in Frankfurt have 'admitted' the oil relief valves are at fault - and as a result are SPECIALLY making another one fit for purpose... they are at present not at the OPC's (to my knowledge) - so don't all rush out to get one fitted..."
You may want to inquire with your service advisor if this has been checked on your car as the source of the buzzing.
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