As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION TYPE:IN MAIN CARGO SMOKE DETECTION SYSTEM (RT SIDE) WARNING LIGHT ILLUMINATED IN FLIGHT. AC DIVERTED TO IND. LIGHT EXTINGUISHED WHEN MAIN CARGO DOOR OPENED. NO EVIDENCE OF SMOKE FOUND. WHILE TESTING SYSTEMS, NR 3 SYSTEM RIGHT DETECTOR LIGHT STAYED ILLUMINATED. R&R NR 3 R SMOKE DETECTOR PER MM 26-17-00 OPS CK GOOD.