As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURN BACK DUE TO NOSE WHEEL STEERING FAULT. MAINTENANCE PERFORMED TROUBLESHOOTING PER TSM 32-51-00-810 FAILURE OF NOSE WHEEL STEERING AND FOUND STEERING SERVO VALVE FAULTED PER TROUBLESHOOTING DATA FAULT CODE 745. MAINTENANCE REMOVED AND REPLACED THE NOSE STEERING CONTROL VALVE AND PERFORMED OPERATIONAL TEST PER AMM 32-51-51 PB 401.