As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HSI HEADING MISMATCH ILLUMINATED DURING FLIGHT. ACCOMPLISHED CHECKLIST. PRESSED HDG/DG BUTTON TWICE, MESSAGE CLEARED. C/W MTC 9340019 STEPS OF AHRS SYSTEM SELF TEST. SYSTEM CHECKS GOOD, NO DEFECTS NOTED. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.