Yep, brush replacement is a sensible first step. Go to one of the following sites, and do a search using the model name.
Check out my site for info:  www.2ndwave.co.uk/manual.html 
www.4directelectricals.co.uk
                                             http://www.ukwhitegoods.co.uk
                                             http://www.domesticspares.co.uk
                
 washerman
                
 March 2008