As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DUAL AHRS FAILURE DURING CRUISE. MADE AN EMERGENCY DESCENT. AFTER TESTING, FOUND NO PROBLEM WITH AHRS BOXES. ON FURTHER INVESTIGATION, ORIGINAL SCREWS THAT HOLD THE INSPECTION PANEL TO THE FLUX VALVES BECAME MAGNETIZED. MFG RECOMMENDED INSTALLING NEW SCREWS. PERFORMED LEAKS TESTS ON THE AIR DATA SYSTEM. NO DEFECTS WERE FOUND AFTER THE TEST FLIGHT.