Replacing a drum bearing, white knight CL 382 WV?

White Knight compact tumble dryer CL 382 WV.
My dryer has started making a noise whilst the machine is operating. I wonder, from the type of rotational noise, if the drum bearing is likely to be the problem and if so is it an easy enough job to perform? I have started to dismantle (the kidney shaped cover is off) at the back and before I continue removing even more of the hundreds of screws some guidance or an exploded parts diagram would be a help. When I turn the fan from the rear the noise appears to be coming from the rear of the drum area. Or could it be the drive belt? thanks in anticipation, Robert