As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CARGO DET 2 STATUS MSG, ON PRE-FLIGHT. TRANSFERRED TO DMI MDDR 58521 IAW DDG 26-16-01-01-01 CAT C. ACCOMPLISHED LOWER CARGO COMPARTMENT SMOKE DET SYS OPERATIONS TEST IAW AMM 26-16-00 501. AFT CARGO DET 2 PASS. THIS CLEARS DMI MDDR 58521, PLACARD REMOVED.