Thesis - extremely strange sound - servo?

[Andraz3d]

Hi everyone

I have a new issue, just before the service (planned next week)

please, take a look at the video and listen to the sound:
https://onedrive.live.com/redir?resid=A ... ideo%2cmp4

So, the strange noise is heard on all RPMs, but it almost disappears on the very low ones. When turning the wheel, the noise gets stronger. And I think that when turning aggressively, I can sense that servo stops working for a 1/2 second.

Unfortunately I could not check the level of the servo fluid, because it is pitch dark. I will do it tomorrow. But, any ideas?

thank you.

[Andraz3d]

it was servo. It ran out of the oil completely. I guess I need to start paying attention to that.