As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED GEAR DISAGREE MESSAGE ON GEAR EXTENSION ON FINAL APPROACH TO CLT. PER QRH, CREW PULLED EMERGENCY GEAR EXTENSION. AIRCRAFT LANDED IN CLT WITHOUT FURTHER INCIDENT. MAINTENANCE TROUBLESHOT, REMOVED AND REPLACED MAIN LANDING GEAR SELECTOR VALVE, BLED NUMBER 3 HYDRAULIC SYSTEM AND PERFORMED CHECKS USING AIRCRAFT MAINTENANCE MANUALS. AIRCRAFT RELEASED FOR SERVICE.