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Barbara H, I agree with paying to get another diagnosis, as hopefully you might get an explanation as to why the trunk release and fan speeds are affected with your nav screen issues. That said, a recent 2 part YouTube video on a Subaru water leak caused a TPMS failure (module is under the driver's seat in a subie and shorted out due to water flooding) that also caused the radio to malfunction, the speedometer not to work, and a complete communications failure of the diagnostics system for the car. Once the car was dried out and the TPMS module replaced, the radio, speedo and OBDII communications all started to work again. What I'm getting at is that many of your car's systems' issues can sometimes be caused by just one part failure. Maybe they are all related? Your best bet after the 2nd diagnosis is a refurbished unit if it backs up your first diagnosis. Its the cheapest route for you on a 9 year old car. (And no, you can't have the one from my wife's car.) Good Luck!