What was found
NOSE WHEEL STEERING INOPERATUVE CAUTION MESSAGE INFLIGHT. COMPLIED WITH QRH, MESSAGE REMAINED. DURING CLIMB AT APROX FL 21, NWS WAS ARMED MESSAGE CAME ON AFTER SELECTING OFF MESSAGE WENT OUT. R & R THE TILLER IAW AMM 32-51-01, NO FIX, SERVICED NLG SHOCK STRUT IAW AMM 12-12-32 AND MTCM 000-12-710-002. OPS AND TAXI CHECKED OK.