As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN'S AND FIRST OFFICER'S AIRSPEED INDICATED A DIFFERENCE OF APPROXIMATELY 40 KNOTS DURING CLIMBOUT. FLIGHT RETURNED TO MSP AND LANDED WITHOUT INCIDENT. MAINTENANCE REPLACED CAPTAIN'S AND FIRST OFFICER'S AIRSPEED INDICATORS. ALSO, REPLACED FIRST OFFICER'S ALTIMETER, OPERATIONAL CHECK NORMAL.