I have a used home with existing craftsman 1/2 horsepower garage door opener (part #41A5021-3C) most likely model #132B2104-1. It was working fine and when you try to activate it, the motor sounds like it's turning but doesn't lift the door. The release haddle does not either. I've pulled and pulled with no release. Any trouble shooting advice or possible problems would be appreciated. Email me at firstname.lastname@example.org
Thank you very much.