Bought one of these control board/optical board kits because upon buying camper, optical board was missing. Refrigerator was working, but coolong too much. Received parts and installed all components included, followed all steps. Now I have a trouble code “o” on my display, which indicates “Cooling unit high temp limit switch is open( if applicable)”. This apparently is not owner serviceable and has to go to dealer? Ive looked and put the unit through its diagnostic modes and have come up with little to nothing. My serial # doesnt seem to be within recalled units numbers. Please help.