@dela_neploxo we have the same issue. Apple replaced the phone for this reason already twice! Last Saturday we drove 81 miles to the closest genius bar and complained that the first iPhone which they replaced had the same mechanical sound issue again. So they replaced it. We we arrived at home we realised that our genius bar, replaced our broken iPhone for a new broken iPhone which is disgusting! So we drove back today to get this issue solved and they simply send us away! Apple Care on the phone cared about this issue but the Apple store which messed up didn't!
I'm really mad about something like this! We have laws and Apple has to obey laws!
Imagine they told me it's expectable that a camera can develop strange noises!
Well not after you just unboxed the phone!