My customer has the Sears Craftsman Model No. 139.53413 garage door opener. All of a sudden it quit working. They called me. What happens is when you push the button it opens about 3-4 inches and stops. Push the button again and it closes. But sometimes the motor keeps running and you have to hit the button again to stop it. Right now it is in the mode of keeping running. I tried a few things. No luck. Any ideas?