As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INSPECTION TYPE:N/A STATUS MSG INFLIGHT INTERMITTENTLY: "MD DET AFT 4".ACCOMPLISHED FIM TASK 26-16-00-810-850 R. 03/15/19. FAULT WAS INTERMITTENT. MAIN DECK CARGO SMOKE DETECTION SYSTEM OPS TEST PERFORMED IAW AMM 36-14-00-710-801 R. 29.05, NO FAULTS.