What was found
AFTER UPGRADING THE AIRCRAFT FOR ADS-B PER SB, AND UPDATING G1000 SOFTWARE, THE AIRCRAFT BEGAN LOSING MAGNETIC HEADING AND DISPLAYING RED "X".
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AFTER UPGRADING THE AIRCRAFT FOR ADS-B PER SB, AND UPDATING G1000 SOFTWARE, THE AIRCRAFT BEGAN LOSING MAGNETIC HEADING AND DISPLAYING RED "X".