Are you sure the bearings are causing the noise? Usually if the bearings are worn they give a low pitch rumble when turned. Make sure its not something trapped between the drums. To change the bearings you have to remove the pulley on the rear, then remove the spider bolted onto the back of the drum,(these bolts will be loctited on and difficult to remove), then replace the bearings and seal in the spider.You probably won't be able to remove the spider unless you take the whole drum assembly out of the white cabinet. Makes it quite a difficult job.
Kenjo
March 2015