Took it apart and replaced all four drum rollers. While I had it apart, just for safety sake, replaced the dryer belt and dryer belt idler pulley. Wasn't too much of a job, but then I am an old airplane mechanic. . The whole job including uninstalling the dryer, hauling it over to my shop, repair, cleaning the inside of the dryer, and reinstalling it took just over two hours. (Okay, so I am slow, I like my coffee breaks.)