I called Larry Fritz, since he has a Beaver about the same age as ours. He was helpful in locating the inverter box. For our model, the 4 breakers are actually built into the inverter box. The problem is locating the box, since it is in the bay area. Our beaver has the entry door in the kitchen area, so the inverter is in the bay area on the passenger side behind the Hurricane heater. I had to almost crawl into the bay to get to the box. Thanks for all of your replys.
Ron