As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: CARGO FIRE DET SYSTEM TEST IS INCONSTANT FOR A&B IN FORWARD AND AFT. UPON ACCOMPLISHING TROUBLESHOOTING IAW AMM 26-00-02, FOUND TEST INCONSISTENT. ACCOMPLISHED CARGO FIRE PANEL RESET AND ELECTRICAL CONNECTOR CLEANING AND ADJUSTMENT PER AMM 26-00-02. OPERATIONS CHECK OKAY AT THIS TIME. NO FURTHER INCONSISTENT TESTS FUND AFTER MULTIPLE TESTS.