remove roof of dryer, 2 srews and pull backwards very hard. remove a side panel - left on my machine - you can then access motor and drum- i also had problems with drum relocation as the bearing support had worn down. not a hard job just fiddly, cast £26 for belt and drum shaft kit - 1,2 hours to have a fiddle around and sort it out.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix tumble dryers.