It has been some time that the above issue has dragged on. I was seeing a 3 to 5 volt variance in my AC power with no load. All appliances seemed to work fine however, it still bothered me. I called Xantrex for some trouble shooting ideas although none of their suggestions resolved the problem. I took the rig into the new LaMesa RV service center here in San Diego. After some extensive sleuthing, they found a junction box on the firewall (front cap wall)with a loose connection. In fact, when they took the cover off, the connector nut fell off on to the ground. Connector tightened and presto no power fluctuation any more.
2006 36FDDS Almost de-bugged
2006 Alpine 36 FDDS