After less than 14 days in service, I got a statement from the technician that it was not possible to order a replacement part. Should I contact Apple support again. It's becoming a vicious cycle. Even after a second inquiry to see if they had any Mac Studio squeaks reported in their database, I got the same answer, no. I have a feeling that maybe a few people in the world have this problem…
I think this is more to do with Apple's internal feedback systems than a lack of data.
I worked with Apple support, gave them detailed data including spectrograms showing the multiple frequencies of the high pitched sound, how they all curved upwards to a steady state when the fans came on as the machine came out of sleep, consistent with fan spinup.
While the machine was with a local AASP, i became aware that the model was so new the serial number did not appear in Apple's internal support databases. Neither was there any availability of spare parts, or the internal systems ability to certify repairs even if there were.
I am exactly the target market for this machine, but I made the decision to return mine because I became aware of the issue immediately upon setting the machine up and knew I could not live with it, and because the return window was closing. Apple's support portal indicates that case supporting notes and uploads (screenshots and data provided to Apple by the customer) are only retained while the case is active. I certainly have not been contacted by Apple since.
I rejected a replacement because of the lengthy lead times, and I have no reason to believe at this point that Apple is fixing the problem with the problematic units, unless they acknowledge the issue.
That leaves me with either re-ordering at a future time and hoping, or waiting for base models to turn up in stock at local retail and take a punt on them, one at a time, returning them until I get a get a good one (and put up with a base config that is less than optimal). Or wait for M2.
I don't believe that Apple wants all these returns flying around (No Apple Stores where I am, so I had to return ship mine via DHL) but unless they take an interest in this issue, that's what will happen.
What I don't understand is why none of the Mac news sites have picked up on this issue and raised it with Apple on users behalf. While I acknowledge the many people, including in these threads, who rightly state they have machines with no high pitched noise issues, there are significant numbers who clearly, and demonstrably, do.