I have a stackable Maytag washer/dryer and the dryer drum has does not turn any more. I first noticed a problem was developing when I pressed the start button and it would buzz for a second or two and then the drum would turn. That several weeks the drum eventually stopped turning and now when you press the start button it just buzzes until it stops completely.

I can turn the drum by hand and when I do I hear a slight rattle noise.

What should I look for when I take this apart?