As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FWD CARGO SMOKE DETECTION LOOP FAULT LIGHT ILLUMINATED IN FLIGHT, FOLLOWED PROCEDURES. ECAM DIRECTED TO LAND ASAP, DIVERTED TO MDT. EMERGENCY DECLARED. REPLACED CARGO ELECTRONIC SMOKE DET UNIT 18WH IAW MM 26-16-12-04. OPS CHECK NORMAL IAW FUNCTIONAL TEST MM 26-16-00-5. PLACARD REMOVED.