UPDATE:
Our friend Chino from South Korea, got back to me with his experience at his local Tesla Service Center, and here is what he said:
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Hello Fabrizio,
I went to the service center this Monday and consulted with Tesla advisor.
The Tesla advisor said the noise was normal at first, but it was found that there was a significantly louder noise and a different band sound compared to other cars brought to the service center.
The part takes about two months to arrive from the US to Korea, and an appointment is scheduled for replacement on October 29th.
The advisor said that even the parts to be replaced can make noise, but I think it's good to try.
In addition, the advisor said that there is a high probability that there will be no noise because the stock of parts for repair is managed in a different lot from the stock of parts for production.
I hope you are doing well and I will contact you again after receiving the repair from the service center on October 29th.
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I guess with "Tesla Advisor" he meant "Service Technician", but this is great news!
And even better, look at what part his service center has ordered for him:
View attachment 716575
And guess what? The damn coolant (water) pump! They call it "battery coolant pump", at least we know that!
At this point, let's wait and see if that's going to solve the problem. If it does, well, we have something in our hands to tell our Service Centers