Dennis ,
You are so correct , dealing with Dometic directly is hopeless .
There is an RV tech that posts over on RV.Net
RV.Net Open Roads Forum: Class A Motorhomes
I am not a member there but read it sometimes
The techs name is Doug Rainer and he seems quite knowledgeable , he works
somewhere in the Dallas area .
If you could make contact with Doug and he was inclined he can advise and
answer your questions .
Ray