What was found
WOW INPUT, CAUTION MSG MOMENTARILY CAME ON AFTER GEAR RETRACTION ON TAKEOFF. CAME ON AGAIN AFTER GEAR EXTENSION ON APPROACH. AFTER NOSE WHEEL TOUCH DOWN, WOW INPUT CAUTION CAME ON STEADY, BELOW 80 KTS, STEERING INOPERATIVE CAUTION & WOW OUTPUT FAIL STATUS MSG. UNABLE TO ENGAGE NWS. COMPLIED WITH QRH, NWS STILL INOPERATIVE. ACFT WAS TOWED TO PARKING.