I will tell you what not to do.
I had several minor issues to resolve, so I took the RV to my local RV repair center. Along with my list I added: Run new HDMI Cable from TV to video switch box (4 feet straight line distance).
I got the bill back: 7 hours labor + new HDMI Cable (my cable was defective) = $770
. We agreed on a final price of $325.
But the worst part...My DW will remind me of this many, many times.