Dryer makes a bad rumbling noise when it's running.
After running the dryer to check it out I lifted the top up and then removed the front of the dryer.
At this point it was easy to remove the drive belt and take the drum out. Once the drum was removed I could turn the rollers that support the rear of the drum. There was a lot of play in the rollers when I turned them by hand. It was very obvious that the old rollers were making the rumbling noise.
After replacing the two rollers the dryer sounded like a new machine.