As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLT - FLT 8054 - SHORTLY AFTER TAKEOFF, THE CREW NOTICED A BANGING NOISE COMING FROM THE LEFT PACK. FLIGHT RETURNED TO FIELD AT CLT AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REMOVED AND REPLACED THE LEFT PACK 35 DEGREE SHUTOFF VALVE AND THE TEMPERATURE CONTROL BOX. OPERATIONAL CHECK GOOD. (M)