As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEAR DISAGREE AND NOSE DOOR WARNING MSG, AND WOW INPUT AND STEERING INOP CAUTION MSG, AND WOW OUTPUT FAIL STATUS MSG WHEN RETRACTING THE GEAR AFTER T/O FROM 12L MSP. COMPLETED QRH RETURNED TO MSP. MTX FOUND DAMAGED NLG BUSHING BACK UP SEAL RESTRICTING STRUT EXTENSION. REPLACED DAMAGED BACKUP SEAL AND SERVICED STRUT IAW CRJ AMM 32-21-30.