As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NOSE WHEEL STEERING INOPERATIVE CAUTION MESSAGE. FOLLOWED BY WOW CAUTION MESSAGE, THEN A GEAR DISAGREE WARNING. MLG DID NOT RETRACT. COMPLIED WITH QRH, EXTENDED GEAR AND RETURNED TO DEPARTURE. REMOVED AND REPLACED THE PISTON AXLE ASSY IAW CMM.