As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CARGO SMOKE DETECTION SYSTEM WOULD NOT TEST. AIRCRAFT FERRIED FROM MLI TO MSP FOR FURTHER REPAIR AND TROUBLESHOOTING OF CARGO SMOKE DETECTION. MAINTENANCE REMOVED AND REPLACED CARGO SMOKE DETECTOR PER AMM 26-13-15-4 OPS CHECKS GOOD. PN CGAB1201-01 SN/OFF 750, SN/ON 088.