As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HEADING MISMATCH INTERMITTENTLY DISPLAYED IN ADVISORY DISPLAY. COMPLIED WITH CHECKLIST PROCEDURE, MESSAGE RETURNED SEVERAL TIMES. COMPLIED WITH IAW CHECKS AND NO HEADER ON MISMATCH MESSAGE OCCURRED, COMPLIED WITH AMM TASK 34-21-00-40-801. OPS CHECKS GOOD. NO PARTS REPLACED. ACFT RETURNED TO SERVICE.