I live north of the 49th and left my unit plugged into shore power this past winter. Went to start everything up last weekend. I have gen power and 12 volt but no shore power. Checked breakers and they are set fine. My unit is a 89 Holiday Ramber class A and has worked fine up till this point. I checked with my service guy and he just turned his head and said "never heard of it"? I have looked every where for a "reset button". ANy ideas?????