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Has it always been doing this? Is this a roll up door? It could be the cables at either end are not pulling even and the 'tighter' one is racking the door. THe windup springs are a bit on the dangerous side to be messin' around. They can be handled, but only with much care. But I believe that's where the problem lies. THe second place could possibly the top tracks are not square with the door in the down position. One more possibility is the door opener is not square and in the middle of the door.
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