1. Loosen 7 externally retained thumbscrews and remove outside protective panel.
2. Loosen 8 captive screws and open door.
3. Remove cover from inside unit by loosening 12 captive screws, and swing unit outward. Brush
everything lightly and blow dirt, dust and sand out.
4. Reinstall cover panel.
5. Behind TCU, remove cover on remote switch deck by removing 6 screws.
6. Brush everything lightly and blow dirt, dust and sand out.