Wayne R -- you are correct on the idiot light cluster signaling the speedo, which has the buzzer and warning in the LCD cluster. When I gradually lost all my buzzers at startup, along with turn signal buzzers, and talked to Actia, they wanted the speedo and the whole panel with the guages. Once diagnosed, they told me the buzzers were in the speedo (which you can see has a speaker area on the back of it), and the speedo had to be replaced to get my buzzers back. Actia turned the whole thing around in a week.
Former Owner, 2006 36MDDS
2010 Arctic Fox 22GK Travel Trailer
2007 Toyota Tundra