As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4168, CREW REPORTED AFTER GEAR RETRACTION, GOT A STEERING INOP MESSAGE. CREW FOLLOW THE AOM AND DECLARE AN EMERGENCY IN ORD. AIRCRAFT REMOVED FROM SERVICE. REMOVED AND REPLACED NOSE WHEEL STEERING MANIFOLD. OPERATIONAL CHECK GOOD IAW CRJ AMM 32-51-50. AIRCRAFT RETURNED TO SERVICE.