As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE WARNING ILLUMINATED. UNABLE TO DUPLICATE. "SMOKE" WARNING NOT ILLUMINATED. R & R FORWARD SMOKE DETECTOR IN AFT CARGO BAY. IAW AMM 26-12-01-00-801 AND 26-12-01-400-801. OPS TEST PASSED. SMOKE WARNING DOES NOT ILLUMINATE. RAN BOTH ENGINES TO DUPLICATE ACTIVE AIRCRAFT VIBRATIONS. SMOKE WARNING DOES NOT ILLUMINATE. NO FURTHER DEFECTS NOTED. RETURNED TO SERVICE.