Chamberlain Powerdrive PD422D 1/2 HP Security Plus Screw Drive Garage Door Opener "whisper drive adjustment" Questions

...whisper drive plus didnt open, looked at sesors upon looking at sesors one is green solid light and one is amber color , does the sesors need to be adjusted to line up or is there another problem. i ...

...Whisper Drive modelHD600. I've check and checked and have no idea why the main rail would bow when the door closes all the way, its subtle but still it bows. If I adjust the down travel so it doesn't ...