Once these cracks occur, the door panel will be able to flex off of the top lip of the door structure, which is needed to hold the panel on tightly to the door. While many fixes are possible, one of the more successful fixes we have seen in panels is when owners have drilled holes in the ribs on the back of the panel, above and below the existing crack, and then secure the crack together by applying zip ties through the drilled holes. Then, in addition to this, add small “L” pieces of metal to a few of the bolts at the top inside of the door shell. The zip ties will prevent that panel from flexing off the top lip of the door, and the “L” pieces add a little more material for the panel to catch on the door shell. These fixes are not visible at all once installed.