As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN'S HEADING 5-10 DEGREES OFF FROM COMPASS AND FIRST OFFICER'S. RECEIVED SEVERAL EFIS COMP MON CAUTION MESSAGES. PERFORMED QRH PROCEDURE AND RETURNED TO SLC. REMOVED AND REPLACED LT FLUX DETECTOR UNIT IAW MM 34-21-04. DEGAUSSED WINGS AND LANDING GEAR. OPS CHECK OF HEADING SYSTEM GOOD.