My son decided to 'adjust' the garage door since it would stick whenever the weather was cold. Instead of increasing the force screw, he completely backed out both the raise limit and lower limit screws. Now I can't get the raise to even engage, and the lower hits the stops regardless of where the limit switch is. I thought I could screw it in until the door stopped and then lower it gradually, but it is all or nothing, all the way closed to the stops then reverses open to the stops. It is only 3 years old. Any ideas of how to fix this???