On our 63 there is no
12V fuse panel. There is a
12v circuit breaker near the battery and another one in area where the trailer cord from the TV is connected to the coach wiring. Look for this area either in the belly skin where the trailer cord enters the Airstream body or inside near this place. It may just be a hole in the interior skin covered by another piece of interior aluminum. This is probably down low in the front.
AC "fuse panel" is a circuit breaker box in the closet. There is still a circuit diagram pasted to the wall near the breaker box.