You can probably fix the area, but if it failed in one spot then other areas will probably follow soon. Replace the door and check the other one carefully- it might be a good time to replace it too. If you can identify what caused the failure maybe you can mitigate that so you won't have to do this again. If the thought of possibly going through this process in 17 more years is more than you can stomach, you may just want to upgrade to a better unit and (hopefully) be done with it forever.

Phil