As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SDCU STATUS MESSAGE. BITE CHECK OF SDCU NOT FAULTING ANY SMOKE DETECTORS. CHECKED CON AND WIRES AT AFT LAV 6WQ AND AFT CARGO BAY SMOKE DETECTOR 5WH. REPLACED SMOKE DETECTOR (6WQ) IN LAVATORY F IAW MM, OPS CHECKED GOOD. REPLACED AFT CARGO SMOKE DETECTOR (5WH) IAW MM 26-16-15, OP CHECKED GOOD. CONNECTORS WERE CLEAN AND SERVICEABLE.