Unplugged dryer, opened rear panel containing schematic diagram, located part numbers for serviceable parts. Searched interwebs. Found how-to video by appliancepartspros.com showing how to fix, very good video instructions. Ordered parts (rear drum bearing kit, idler pully, belt) from their site because the vid was helpful. Parts arrived promptly. Probably didn't need pully or belt but figure as long as I'm in there replace them. Put it back together. Happy. Don't forget rule #1: unplug the dryer before working on it.