As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STEERING FAILURE - BSCU 1 FAULT ON TAXI AIRCRAFT COULD NOT BE STEERED WITH RUDDER PEDALS OR TILLER. MAINTENANCE REMOVED AND REPLACED THE CAPTAINS N/W/S HAND WHEEL TRANSMITTER UNIT (1GC) IAW AMM 32-51-11-401, OPERATIONAL CHECK WAS GOOD. VENDOR TEARDOWN REPORT OF NOSE WHEEL STEERING CONTROLLER S/N 188 CONFIRMED FAILURE OF UNIT. MICRO SWITCH (P/N TS116067) WAS FOUND INTERMITTENT, AND THE PLATE DRIVE, MAIN SPRING (P/N TS116022-4), AND RINGS (P/N TS116095-3) WERE FOUND WORN BEYOND LIMITS. UNIT WAS OVERHAULED PER CMM 32-51-11.