As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW DECLARED EMERGENCY PERFORMED AIR RETURN FOR NOSE WHEEL STEERING MESSAGE AFTER GEAR RETRACTION FLIGHT LANDED SAFELY WITHOUT FURTHER INCIDENT. INTERROGATED MDC AND FOUND A ONE TIME MESSAGE FOR NWS ARM SWITCH DISARMED IN FLIGHT. T/S PER CRJ900 FIM 32-50-00. OPS CHECKED GOOD AND TAXI CHECK GOOD.