I wonder what's in the repair kit? Is the magnet within the gasket used to pull the door into the body or is it just a chunk of metal to thicken the gasket? The Dometic in my trailer is as old as the trailer 24 years... and there isn't any metal in the gasket. This must be a new 'feature.'
The way to test a gasket is to cut a strip of paper, close the door with the paper hanging out between the gasket and the frig body. Pull on the paper. Does it tug out or pull freely out? Check several places on all four sides.
And, we all know... just because someone has the letters "RV" before their title
doesn't necessarily mean they know what they're doing. Who's to say the RV repair person has EVER changed a refrigerator
So, your choices... if the paper tug determines it's a leaker is to use some other gasket material. Or, buy the kit yourself and do the work yourself. OR, take it to a RV repair person and let them buy the kit and be liable for the repair. I wouldn't buy the kit and have someone else put it in. YMMV