I called Spartan tech support today and was informed that there isn't a separate controller on my coach. It's all governed through the ECM. Guess that's why I couldn't find one. He advised me to take it to a Cummins dealer where they could diagnose it through the ECM.
Called the local Cummins dealer and they acted hesitant to even try to fix it as they said it wasn't something Cummins installs.
So looks like I'm going to have to pay them $130 an hour to scratch their heads.........
2005 Newmar Dutch Star 4024
Pulling my 2012 Malibu w/Blue OX & Patriot brake unit