As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CARGO FIRE AFT LIGHT DOES NOT ILLUMINATE DURING THE TEST PROCEDURE. ACFT GROUNDED. PERFORMED CARGO BAY SMOKE DETECTION, OPS TEST REF 26-16-00, OPS NORMAL NUMEROUS TIMES. DUE TO HISTORY R & R 3 EA AFT PIT A SMOKE DETECTORS REF MM 26-16-01.