As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STALL WARNING STICK SHAKER ACTIVATED AT 190 KNOTS AFTER TAKEOFF. FLIGHT RETURNED TO MSP AND LANDED WITHOUT INCIDENT. MAINTENANCE COULD NOT DUPLICATE DISCREPANCY ON GROUND WITH TEST EQUIPMENT. REPLACED THE LEFT STALL WARNING TRANSDUCER AND BOTH STALL WARNING COMPUTERS AS A PRECAUTION.