As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NUMEROUS EFIS COMPUTER MONITOR MESSAGES, HEADING. FO'S SIDE OFF 20 DEGREES OR MORE TO PLUS SIDE. SWITCH TO DG, REALIGNED AND OFF 20 PLUS DEGREES AGAIN. STAYS MATCHED WHEN FO'S SIDE IN DG MODE. REMOVED AND REPLACED REMOTE COMPENSATOR UNIT.