Opened up the cabinet to find metal shavings filling the whole bottom of the dryer. Removed the bulkhead and found the tumbler bearings were completely gone. While I had it opened, I noticed the belt was almost shot and it needed a new front felt seal and fiber washers on the rollers. I paid the extra 3 bucks for priority shipping, received the parts in a few days. It took one evening to diagnose the problem and order parts. And one evening to install the new parts. I also foil taped the joints in the 4" vent duct. The repairs were fairly easy. Saved a lot of money on professional repair. Spent about $70 in parts. The dryer is now quieter than it has been in years! Hopefully more energy efficient now too. It's about 34 years old, maybe I can get another few years out of it.