As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT, VIBRATION WAS FELT PASSING THROUGH 15,000 FEET. AIRCRAFT RETURNED TO MSP AND LANDED WITHOUT INCIDENT. MAINTENANCE ADJUSTED INBOARD FLAP RIGHT AND LEFT AFT ECCENTRICS AND LEFT OUTBOARD FLAP ECCENTRICS. PERFORMED RIG CHECK OF FLIGHT SYSTEM, CHECKED OK.