As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CARGO FIRE LIGHT FAULT DETECT IN NORMAL MODE LIGHT IS INTERMITTENT. ACFT GROUNDED. CLEANED ALL 3 AFT CARGO COMPARTMENT LOOP A SMOKE DETECTORS IAW MM 26-16-01. DURING CLEAN, FOUND DETECTOR A1, M2242, WITH DAMAGED COMPONENTS ON CIRCUIT BOARD. R & R M2242, REF MM 26-16-01. CARGO FIRE PANEL DETECTOR SELECT SWITCH PLACED TO NORMAL GROUND VERIFICATION SUCCESSFUL, REF MM 26-16-01.