As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED A LT PACK FELL OFF LINE FOLLOWED BY A HIGH PRESSURE CAS MESSAGE. CREW ELECTED TO RETURN TO CLT AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND PERFORMED AN OPERATIONAL TEST OF THE ACS SYSTEM IN ACCORDANCE WITH THE AIRCRAFT MAINTENANCE MANUAL. OPERATIONAL CHECKS WERE GOOD AT THIS TIME. AIRCRAFT WAS RELEASED FOR SERVICE.