As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE FROM KBWI, THE CREW PERFORMED COMPASS RATING CHECK, BOTH COMPASS SYSTEM HAD EXCESSIVE DRIFT (20 DEGREE IN 30 MIN). THE CREW LANDED IN CYYR WITHOUT INCIDENT. MAINTENANCE INSPECTED AND REMOVED AND REPLACED FOG GYRO COMPASS SYSTEM. OPERATIONAL CHECK GOOD IAW DC8 MAINTENANCE MANUAL 34-11-1. AIRCRAFT WAS RETURNED TO SERVICE.