First, I'm assuming that you meant Hemisphere. Are you asking about a Salem Hemisphere?
Second, you do know that this Forum has NO association with Forest River Inc, rignt? It's just made up of owners of FR products.
Not sure if your RV shop techs can't diagnose it, that anyone here would could do better.
Dan-Retired California Firefighter/EMT
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package