As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DEPARTURE CLIMB, UNABLE TO ACTUATE LANDING GEAR HANDLE FOR GEAR RETRACTION. UPON FLAP RETRACTION, TAKEOFF WARNING HORN SOUNDED. SUSPECTED AIR GROUND SENSING PROBLEM. FLIGHT DIVERTED TO MSP WITHOUT FURTHER INCIDENT. MAINTENANCE SIMULATED IN-FLIGHT MODE AND COULD NOT DUPLICATE MALFUNCTION. CLEANED AIR GROUND SENSOR. PERFORMED OPERATIONAL CHECK OF TAKEOFF WARNING SYSTEM WITH NO DISCREPANCIES NOTED.