I opened up the dryer back, turned it on and heard the sound in the front. I closed the back, opened the front, and found the noise. Opened up the blower motor front and found a wobbly blower vane. Looked up the Appliance Pros schematic for my model, ordered the part, got it in three days. I installed it, actually easy to do! Put all the covers back on and it's running great! I will continue to only use Appliance Parts Pro. The schematics helped me figure out what was inside and what to try and replace.