The first thing I did was watch the AppliancePartsPros videos. I thought it was the idler pulley but when I got in there it was the fan. The fan has stripped out. So I watched that video and ordered the fan. It was simple to do by following the videos step by step. The most difficult part was replacing the felt drum seal (mine had a tear in it). It took a minute to get the glue right so I didn't get it all over me and everything. Note: wear nitrile gloves! AppliancePartsPros saved me from purchasing a new dryer. My old one runs quietly like a champ now!