i've lost my manual for my craftsman garage door opener. My openers won't work and I can't figure out how to reset them. Even using the inside button, I can open the door, but have to hold it down until it closes. Before the car transmitters stopped working all together, they would open the door, but wouldn't close it. Last time I had someone out it cost almost a hundred dollars for 2 minutes work. Can you tell me where to get help?