2003F12x, 100 ~ hrs. Display not visible, sunfaded, but ski continued to run. About 2 hrs later, the turbo would not engage at its usual +- 5,000 rpm. Ran as non turbo for another hr or so, then the display died and nothing, no start, no power and of course no codes. I have a replacement display inbound, and my question for the experts: Should I replace the turbo boost valve while I'm changing out the display, or should I wait and test to see if the display was causing the turbo not to engage? TIA.