What was found
CREW REPORTED GEAR DISAGREE RED CAS MESSAGE (DOWN POSITION SELECTED) ON APPROACH INTO CLT. AFTER LANDING THE AIRCRAFT HAD TO BE TOWED TO THE GATE BECAUSE OF NOSE WHEEL STEERING CAS MESSAGE AFTER LANDING. MAINTENANCE REMOVED AND REPLACED THE LANDING GEAR SELECTOR VALVE AND CHECKED THE NOSE WHEEL STEERING PER THE AIRCRAFT MAINTENANCE MANUAL. RETRACTION AND EXTENSION CHECKS WERE DONE PER THE AIRCRAFT MAINTENANCE MANUAL. AIRCRAFT WAS RELEASED FOR SERVICE.