Last thing I can proposed is to see if all appliances work: micro-wave, refrigerator, outlets, water heater to see if again both side of electrical panel are supplied properly from shore power. After that you would need to use a multi-meter and start troubleshooting circuits if you are comfortable with it or get an RV tech or bring back to dealer.
2011 Rockwood 8319SS with ProPride 3P hitch/GoodYear Marathons/TST TPMS 507
2008 F250 Lariat CC SB 6.8L V10 4.10 axle ratio (NITTO TERRA GRAPLER G2 LT275/65R20E)
Yamaha 3000iseb generator:Progressive Ind. EMS-HW30C : Eastern Ontario
Nights Camped: 2011(21) 2012(36) 2013 (17) 2014 (18) 2015 (18) 2016 (36)