As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FORWARD CARGO SMOKE INDICATION ON UPPER ECAM FLASHED INTERMITTENTL, THEN CAME ON CONTINUOUSLY. DISCHARGED AGENT. RETURNED TO FIELD. *S/D* DEFECTIVE SMOKE DETECTOR COUPLED WITH OPEN GROUND 1999UT TERMINAL BLOCK. REPLACED SMOKE DETECTOR CONTROL UNIT AND SMOKE DETECTORS. CHECKED WIRING AND TEST FLEW A/C.