When the dryer was turned off the noise stopped immediately even though the drum was still turning. The shafts that the rear rollers were mounted on were dirty which was probably the cause of the noise. Taking off the triangles looks easier in the video than it actually is. I took the outside ones off with a small screwdriver and the inside ones I cut off with wire cutters. I cleaned the shafts with alcohol and put some graphite powdered lubricant on them before I put the rollers on. I used powdered graphite as lint wouldn't be attracted to it like it would be to grease. I ended up using the original belt as the one in the package was too tight. I checked it before I ordered the package and it was supposed to work. Not a big deal as the old belt was good.
Replacing the drum seal is not difficult as long as you have three hands.... I used some spring clips to hold the seal as I worked it around the drum.