We have a Stanley screw-type garage door opener installed around 1997 so it doesn't owe us anything. It opens perfectly, no issues. Closing is an issue. If i push and immediately release one of the buttons (there are two) the door may close a few inches and usually just stops. Push the botton again and it'll open all the way unless I push the button again to stop it. If I push and hold the button the door will close all the way. My first though was the photo beam but I can stop the door from opening all the way by pushing the button. In the past if the door reverses due to an obstruction, it would open all the way. I could get universal photo beam replacements but would like to verify that is indeed the problem first. I thought about jumpering the wires from the photo beam to the operating head long enough to confirm or eliminate but not sure how. Does anyone have a thought? Thanks for any input.