What was found
(CAN) DURING LANDING, THE NOSE WHEEL STEERING WOULD NOT WORK. THE ACFT WAS TAXIED TO THE BAY USING ASYMMETRIC BRAKE AND POWER. LANDING GEAR SELECTOR VALVE REPLACED. LANDING GEAR SELECTOR VALVE FUNCTIONAL AND LEAK CHECKS CARRIED OUT, IAW AMM 32-31-06 & 29-71-00. NOSE WHEEL STEERING CHECKED, AND LANDING GEAR SELECTOR VALVE REPLACED. NOSE WHEEL STEERING WILL NOT WORK WITH THE LDG SELECTOR IN FAIL MODE NO HYDRAULIC PRESSURE DIRECTED TO THE UNIT. SELECTOR ASSUMED FAILED AT LAST GEAR EXTENSION/LANDING.