If you can find a Service Center that only works on RVs and doesn't Sell them you will have the best luck, or a good Mobile Service Tech.
There are a few good Service Centers within a Dealership, but they are far and few between. Seems Dealerships are out to sell a product, but not support it after the sale.
Michelle & Ann
2018 Chevy 3500HD Crew Cab High Country DRW, D/A, 2016 RW39MB, Dual ACs, Auto Level, Auto Sat Dish, Stack W/D, King Sleep #, 17.5" Sailuns w/Disc, MORryde IS & Pin, Comfort Ride Hitch, 5.5 Onan, Res Fridge & Induction Cook Top