What was found
SHUTDOWN THE NR 1 ENGINE WHILE TAXING IN. AFTER THE HYDRAULIC PRESSURE FELL TO ZERO, THE NOSEWHEEL STEERING LOST HYD PRESSURE AND SLOWLY ROTATED TILLER TO FULL LEFT DEFLECTION. WAS UNABLE TO TURN THE TILLER. RESTARTED THE NR 1 ENGINE, ALL CONTROL OF NWS RETURNED TO NORMAL. NO ECAM WARNINGS DURING THIS ACTION. ON CREW DEBRIEF, IT WAS BLUE SYS THAT WENT TO ZERO, AS NORMAL. SHOULD HAVE NO EFFECT ON NWS. TROUBLE SHOT IAW FCD 6-32-040, REV A. NOSE WHEEL STEERING FAIL STEP 7 WHICH REQUIRES THE REPLACEMENT OF RELAY 14KC CPN 2110771. REMOVED AND REPLACED RELAY 14KC IAW ESPM 20-46-50 AND OPS CHECKED PER FCD 6-32-040, REV A, AND AMM 32-51-00-0-5. STEERING NOW CHECKS GOOD ON BOTH RELAYS 13KC AND 14KC. OK FOR SERVICE.