What was found
AFTER TAKEOFF, A NOSE STEERING INOPERATIVE CAUTION MESSAGE CAME ON. AFTER SELECTING GEAR UP, A GEAR DISAGREE WARNING CAME ON. NOSE DOOR OPEN WARNING CAME ON. FOLLOWED QRH, GEAR EXTENDED AND LOCKED. THE GEAR STAYED DOWN AND LOCKED FOR THE ENTIRE FLIGHT. THE MAINS DID RETRACT. RAN QRH FOR NOSE STEERING. AFTER TURNING STEERING SWITCH OFF AND ON THE NOSE STEERING CAUTION RETURNED. LEFT NOSE STEERING OFF IAW QRH. AFTER LANDING WOW INPUT CAUTION EXTINGUISHED. AT GATE UNDER DIRECTION OF MOC NOSE STEERING WAS SLELCTED ON AND NO CAUTION APPEARED. PERFOMED OPERATIONAL TEST OF NG STEERING. NO DEFECTS NOTED. IAW AMM32-51-00 PERFORMED VISUAL INSPECTION NOSE GEAR. NO DEFECTS NOTED. FOUND NOSE STRUT HAD NO HYD FLUID. SERVICING PORT WAS SECURED CLOSED, O-RING GOOD. SERVICED NLG STRUT IAW J/C 12-710-00. PERFOREMED GEAR SWINGS IAW AMM 32-30-00. OP CHECKED GOOD.