Sorry to hear of your troubles while on the road.
Believe it or not, I had a good experience with LaMesa RV's service department in Phoenix (not the Mesa location) this past Summer with very similar issues on our Magnitude full wall slide... Rear motor and harness were replaced. I dealt with Frank Troutman (service advisor)
FYI - Vroom is booked out pretty far for the retrofit as of the last time I emailed with Brian. I have an appointment scheduled for May.
RV: 2021 Class C Magnitude SV34
Toad: 2015 2dr Jeep Wrangler
Motorcycles: BMW K 1600 B, Harley Davidson Heritage Softail (EVO)