Replaced motor. Also replaced belt as long as I had it taken apart. My dryer is a Whirlpool Duet, purchased in 2012. I used the AppliancePartsPros.com video that goes with AP3094233 (the motor's part number) as a guide, and I would not have attempted it otherwise. Unfortunately, my dryer was newer than the one in the video, or at least had different panels and screws, etc., etc., but I nevertheless figured it out in the end! It probably would have taken less time if I had a dryer whose insides looked exactly like the video, but it still worked out (probably 2.5 hours, including vacuuming the insides as I went along). (I recommend taking notes as you take it apart, and photos with your phone as you go along, if you have to diverge from the video instructions as I did. That was a big help in getting it put back together in the proper order without any trial and error.)