I consulted with the internet and your website and determined I had a bad roller wheel. I was going to buy just one but determined if you have to take the thing apart, just replace all of them. These lasted 10 years after all. Opened up You Tube for the method to take the dryer apart. After doing the washer last year, I felt pretty bold and just ripped into the project. Within 30 minutes I had the drum out and located the problem wheel ( rear right side). It was locked up due to hair build up and the wheel was wore flat. I compared the other wheel and it seemed "not right" so I replaced that also. I started to put the machine together after a good cleaning (lots of hair and lint) and when looking at the wheels in the front, one of those was also bound up and loaded with hair and lint. Replaced both of those, assembled the machine and she now runs quiet, sounds better and dries faster.
Hints, when doing this job buy all 4 wheels from a quality dealer. These are cheaper on eBay however when you read the comments, these wheels are missing the axels or just last a few cycles and they squeak again. Also, plan on using a vacuum and cleaning up the inside of the machine. Lots of lint, hair and other things escape the drum and duct and this material gets into the motor, blower, heater and sensors. Clean now and prevent a problem later.
This was my 2nd time using Appliance Parts Pros and they are fast with shipping and the diagrams work well to determine what you need. This job took me about 2 hours but sure I saved at least $300 from using a professional.