Genie 1/2 HP Screwdrive Model 12A

I do not know how old my garage door is; however I have been in the house for 8 years and it was here before me. When I open the garage door it stops about every foot or so. I literally push the button atleast 8-15 times. When I close the door it stops about at the same place but starts to go back up automatically. I downloaded the Genie ScrewDrive manual Series IS, ISL, IC, and H and looked at the setting where there are suppose to be two screws on the back to adjust the close and open; however there are two places for screw, but no screws. Have any ideas? For starters I think I would remove the cover (power cord unplugged) and inspect where the adjusters are supposed to be. Sounds as if it's a force adjustment issue and there isn't much you can do without the adjusters. What type of springs are on the door? You may have a failed spring causing excess lift force requirement.

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