i am not seeing my serial number in the list 139 18060 in the list for manuals. my door seems to have too much pressure put on it when down and as it is going down it buckles on the left side second pannel from the top. changed the hinge in that area on sone advice from a friend but it made no difference. any ideas or a manual would be greatly appreciated. the door is four pannels across and three up. thanks for any help you can offer