Strange, but nearly audible noise, while the computer is doing tasks...

Hello everyone!

Google Translate:

I have a 13-inch, 2018, Touch Bar MacBook Pro with such specs as Intel Core i5, 8 GB RAM, macOS High Sierra 10.13.6 (latest update).

Recently I began to notice that under certain load on the computer you can hear some very quiet noises, for example when Mac turns on or opens a heavy application. I guarantee that this is not a fan sound, however this sound comes from about the middle of the keyboard, sometimes closer to the speakers, and you can hear it if you lean your head higher towards the keyboard, but not very close. This noise is difficult to describe, it does not look like mechanical, but at the same time very soft and it seems as if someone is scratching or poking at something. Again, the sound is barely noticeable. The computer speakers are completely in order, the music plays without problems and is very clear. You can recreate the experience and run a benchmark and then maybe also notice a rustle.

I understand that, most likely, it's a defective device, but I really need your help. If you can, then try to repeat the experiment on your device, and tell me if you have almost the same small noises. It is best to check and try in an absolutely quiet room, for example at night ... Although with extraneous noises you can also hear the strange noises.

Thank you in advance for your answers! Later I'll try to record the sound on the recorder where my strange phenomenon is heard, if it helps.