Replaced the rear seal on the drum. While I was at it I decided to replace the rollers, the belt, the idler pulley and the front bearing. Vacuumed out the whole cabinet and put it all back together. The whole job took about an hour. It was easy. The dryer runs tight and quiet as new again. We were looking at buying a new dryer but the $90 to tune up the old dryer saved us $300.