As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKE OFF LEFT PNEUMATIC SUPPLY DUCT RUPTURED, CAUSING A TAIL COMPARTMENT TEMP HIGH CONDITION, THERMALLY DISCHARGING BOTH FIRE BOTTLES. COCKPIT INDICATING TAIL COMP TEMP HIGH AND BOTH AGENT LOW LIGHTS. AIRCRAFT PERFORMED AIR TURN BACK TO ATL. REPLACED DUCT AND BOTTLES