My Raymarine C80 started a scroll pattern when I turned it on for the first time this season. I was told by 2 shops online that it is the video card. Both stated they could repair it, but one also said it it probably just loose and needs to be reseated, but entails a a deep breakdown of the unit. His price was reasonable, but has anyone ever attempted this repair? If it is not too difficult I just assume do it and be back up and running in a day. I sold the boat and want to make sure it is operating correctly before I drop it off.