Replacing a damaged or broken panel is an easy DIY project. First, release the door from the bottom rail and remove all of the old rollers. Then install new panels on each side by attaching them with hardware (bolts provided in kit). Finally, attach new rollers to the side rails and slip the cables back into the clips. When your door is open, you can use a level to check that the bottom track of each side panel is parallel to the concrete floor.