As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED THE CABIN NOT PRESSURIZING AFTER TAKEOFF FROM CLT. CREW RETURNED TO CLT AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND PERFORMED A PRESSURIZATION CHECK OF THE AIRCRAFT USING THE AIRCRAFT MAINTENANCE MANUAL. NO DEFECTS WERE NOTED. AIRCRAFT WAS RELEASED FOR SERVICE.