What was found
AT FL320, CARGO FIRE LOWER AFT DISPAYED WITH MASTER WARNING, LEVEL 3 ALERT AND AURAL TONE. DISCHARGED BOTH BOTTLES DURING REMAINDER OF FLIGHT. ON ARRIVAL CHECKED AFT AND CTR CARGO COMPARTMENTS, NO SIGN OF FIRE OR SMOKE. MANUAL CARGO FIRE TEST CARRIED OUT, NO FAULTS OBSERVED. BOTH FIRE BOTTLES WERE DISCHARGED AND AGENT LOW LIGHTS ILLUMINATED. 5 SMOKE DETECTOR UNITS DISCONNECTED. ACFT OK FOR SERVICE. COMPLIED WITH EA1-2612-146196 PART 2, REPLACED ALL 5 SMOKE DETECTORS IN CTR/AFT CARGO COMPARTMENT IAW MM26-14-01-4 AND OPS TESTED IAW MM26-14-01-5, FOUND. FINAL CLOSED, OPS OK, NO FAULTS NOTED.