As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED A BLEED DUCT RED WARNING MESSAGE AT FL 200. THE QRH WAS RUN AND THE AIRCRAFT RETURNED TO CLT LANDING WITHOUT INCIDENT. MAINTENANCE INSPECTED AND FOUND THE AIR CYCLE MACHINE LEAKING. THE AIR CYCLE MACHINE WAS REMOVED AND REPLACED. CHECKS WERE MADE PER THE AIRCRAFT MAINTENANCE MANUAL AND THE AIRCRAFT WAS RELEASED FOR SERVICE.