I am at a loss on how to reply to your post.
1) If it worked before some dufus screwed with it and then it didn't, how is it the equipment's fault?
2) U-Neek RV sounds like a place to avoid at all costs. I would drive 500 miles to find a better repair center. Their "repair tech" is a butt munch who blamed YOU for his (or her) ignorance and hack job on your camper.
3) While I don't normally recommend midnight revenge; U-Neek RV sounds like a candidate for a high altitude drone strike with no remorse.
4) Genesis is the next generation Concertone radio and a "repair shop" worth the space it occupies would know that.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW