Some lesser brands may not even have one, but I think HR provides them. Hopefully another HR owner will come along and help out. Or call Monaco'HR Customer service and ask. I believe you can request electric and plumbing schematics as well, always a good thing to have on hand.
Mine (another brand) was under the sink, hidden at the very back.
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC