Bosch WFO2467 Very Noisy Spin Cycle?

Hi,

The above is making a very loud constant noise during the fast spin cycle.

Do you think it is brushes or drum bearing - machine is 4.5 years old and has had a hard life what with 3 kids.

I have replaced brushes before on an old Hotpoint, so is it similar on a bosch.

How difficult are the bearings to change if it is that?

Many thanks

Matthew