I have a Hoover Windtunnel. I have a Hoover Windtunnel Farrington upright model U6431-900It has

Question

I have a Hoover Windtunnel Farrington upright model U6431-900It has worked flawlessly until last week. The roller brush has stopped turning and I believe it is the belt that has broken but I am not sure how to remove the cover to inspect it and replace the belt if that is the problem.Please inform me how to perform the operation and what I should I look for?Is there a site with a diagram on how to replace said parts?Thanks for any and all helpful info that you can supply me with.Larry