As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SUPPLIMENTAL INFORMATION, WHILE ENROUTE THE CREW REPORTED RECEIVING A NOSE WHEEL STEERING FAULT. THEY ARE CONTINUING TO IAD AND THE TOWER HAS DECLARED AN EMERGENCY FOR THE FLIGHT. DURING CRUISE RCVED STEERING INOP CAUTION MSG C/W. QRH MSG DID NOT CLEAR W/SWITCH CYCLE. NO ADDITIONAL ASSOCIATED MSG'S NO HYD SYS NR 3 FAULT. AIRCRAFT REMOVED FROM SERVICE. REPLACED NOSE LANDING GEAR HARNESS PN 17300-233 IAW AMM 32-61-25 REF 316728/3 FOR RVDT REPLACEMENT.