As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE DETECTOR ACTIVATED IN FLIGHT. VISUAL INSPECTION OF CARGO COMPARTMENT SHOWED NO EVIDENCE OF SMOKE. ZONE NR 2 WOULD NOT TEST. REPAIRED CHAFFED WIRES AT NR 1 & NR 3 SMOKE DETECTOR. RELAMPED TEST LIGHT ON NR 2 SMOKE DETECTOR IAW DC6 MM 28-5-5 OPERATIONS CHECKED GOOD.