As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PASSING APPROX FL300, RECEIVED A AFT & BULK SMOKE INDICATION. COMPLIED WITH ECAM CHECKLIST AND RETURN TO DEPARTURE. NO SMOKE INDICATION INSIDE ACFT. FIRE CREW HAD NO HEAT INDICATIONS ON AFT END OF ACFT. REPLACED AFT CARGO BAY SMOKE DETECTORS 9WH AND 44WH, BULK CARGO 11WH AND 10WH PER A/C M/M 26-16-11-04 AS A PRECAUTION , TESTED GOOD REF MM 26-16-00.