As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURN BACK. FLIGHT CREW REPORTED AFT CARGO SMOKE/HEAT ECAM WARNING. NO SMELL OF SMOKE, CARGO FLOOR WAS NOT HOT. DISCHARGED AFT CARGO BOTTLE. NOTE: THIS WAS A WARNING INDICATION ONLY, NOT AN ACTUAL FIRE. TROUBLESHOT SMOKE DETECTION SYSTEM AND REPLACED SENSOR. REPLACED AFT CARGO EXTINGUISHER BOTTLE. SYSTEM TESTED OKAY.