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. AS A PRECAUTION, NEED TO INOP SMOKE DETECTORS IN AFT AND BULK COMPARTMENTS, HENCE ALL 5 SMOKE DETECTOR UNITS DISCONNECTED. ACFT OK FOR SERVICE.