As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT FROM MSP, THE RIGHT ENGINE EXPERIENCED SURGES AND FLUCUATING ENGINE PARAMETER READINGS. THE FLIGHT CREW FOLLOWED COM PROCEDURES, RETURNED TO MSP, AND LANDED WITHOUT INCIDENT. AN EMERGENCY WAS DECLARED ON APPROACH TO LANDING DUE TO RIGHT ENGINE SURGING. MAINTENANCE REPLACED THE FUEL CONTROL UNIT LOCATED ON THE RIGHT ENGINE. OPERATIONAL CHECK NORMAL.