I've replaced the belt, rollers and tensioner. Then found out it was pretty bound up behind the motor with lint and the drum was turning hard. I opened up the back and cleaned everything out. The dryer runs but starts and stops on it's own. I took the drum out and ran it to see if the motor would run on its own. I ran it for about 4 or 5 minutes, then shut it off and started it again. When I restarted it, it hummed and the motor turned very slowley, then it shut off. The motor seems to spin freely. Thanks for any help you can offer