As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE SWINGING THE COMPASS ADJUSTMENTS, WOULD NOT COMPENSATE ANY CLOSER THAN 18 DEGREES ON AN EAST HEADING. FOUND THE ENGINE MOUNT TO BE MAGNETIZED ON THE UPPER RIGHT AND CENTER FIREWALL ATTACH POINTS. SUBMITTER SUSPECTS THIS OCCURRED WHEN THE MOUNT WAS REPAIRED WITH AN ARC WELDER. THE PROBLEM WAS ELIMINATED BY REMOVING THE MOUNT AND PASSING IT THROUGH A DEGAUSSING COIL.