As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN'S RMI WAS PRECESSING 5 DEGREES TO THE RIGHT DURING CLIMBOUT. FLIGHT RETURNED TO MSP AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED LEFT FLUX VALVE AND DEGAUSED OUTER LEFT WING. OPERATIONAL CHECK NORMAL AND AIRCRAFT RETURNED TO NORMAL.