I took of the dryer back panel off and while the dryer was running looked to see if I could see anything. Discovered the pulley-idler was wobbling on its shaft as the dryer drum went around. Ordered a new part; replaced the part in less than 5 minutes (Recommend taking pictures of how the belt is wrapped around the pulley-idler). Had the dryer back in place and running normally in less than 15 minutes.