As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
COMPASS FLAG APPEARED ON CAPTAIN'S HSI DURING CLIMBOUT. NEITHER CAPTAIN'S COMPASS CARD NOR FIRST OFFICER'S RMI WOULD FOLLOW HEADING CHANGES. FLIGHT RETURNED TO MSP AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED NR 2 DIRECTIONAL GYRO WITH NO HELP. REPLACED FIRST OFFICER'S RMI, OPERATIONAL CHECK NORMAL.