Ender 5 Pro high pitch grinding noise

[Bulito]

Hey there!
I got my ender 5 Pro a week ago, did some tests and first prints, but there's an annoying grinding noise (seems to be on the Y-axis). It's quite high pitch grinding.
The Y-axis still seems to move correctly though. Do you have any idea of what could I do to remove this noise?

Thanks in advance,
Bulito