Older garage door opener. LiftMaster Professional, date built 05/06. Model 41A5685, part 41DB001-1C.
Has been working great for many years, but recently started acting up. When closing the door, as soon as it hits the ground it opens back up. I think I need to adjust the limit switch but not sure how.
I long lost the manual. There are two buttons in the back, one red, one black.
Any suggestions greatly appreciated.
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