As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - ON FLIGHT 2560, NOSE WHEEL STEERING INOPERABLE. THE CREW PERFORMED THE CHECKLIST AND THE FAULT WAS CLEARED. THE AIRCRAFT WAS TAXIED AND COULD NOT DUPLICATE THE FAULT. OPERATIONAL CHECKS WERE GOOD AND THE AIRCRAFT WAS RETURNED TO SERVICE.