We are on a family boating vacation and of course the boat is acting up. 2008 20SSV. the boat runs fine until we surf. It usually sputters once, then the Service Required message comes on. The boat still runs, so we haven't had to be towed, but we have no display so can't do any watersports. Our mechanic lent us his Diacom which says it's a MAP sensor error. We have now purchased 3 sensors -one from OReillys auto, one from a marine shop and one directly from Indmar. None seem to be fixing the problem. Boat was fine again until we surfed last night. It ran great after surfing until this morning when the water was like glass and I talked hubby into taking me out for a 'board. Service Required again. I know we can clear the error by heating and cooling, but we would like to know what is causing it. Unfortunately, the trailer is in the shop getting bunks redone, so we can't even pull the boat out to get it inspected. Any ideas?