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Check the photo eyes.
it is often the case where a door that is almost closed the rollers can move the track causing a misalignment of the photo eyes. Especially if you have a chamberlain, (craftsman or liftmaster). You may need to adjust the sensitiity setting. Check the springs, probably not the problem. also sometimes something attached to the door can break the photo eye beam, causing it to reverse, (spider webs, struts).
Ryan
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The Garage Door Pro
TradeMarkDoor.com
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