What was found
NOSE WHEEL STEERING FAILURE - ON SHORT AND FINAL APPROACH INTO CUN EN ROUTE FROM PHX WITH LANDING GEAR DOWN ECAM INDICATED NOSE WHEEL STEERING FAULT (2), GREEN HYDRAULIC PRESSURE WAS NORMAL AND LANDING WAS NORMAL. AFTER CLEARING RUNWAY RECYCLED ANTI-SKID SWITCH AND FAULT CLEARED, DURING TAXI TO GATE NOSE WHEEL COCKED 90 DEGREES LEFT, SET BRAKES. MAINTENANCE REMOVED AND REPLACED NOSE WHEEL STEERING SERVO CONTROL (6GC) IAW AMM 32-51-51-000-001, OPS AND LEAK CHECKS WERE GOOD. TEAR DOWN REVEALED SERVO VALVE FAILED VOTAGE BALANCE TEST. UNIT WAS REPAIRED IAW CMM 32-57-01 REV. 8.