What was found
ON PREFLIGHT, RECEIVED LOWER AFT CARGO FIRE WARNING. RAMP PERSONNEL COMMUNICATED SMOKE FROM AFT BELLY COMPARTMENT. DISCHARGED FLASHING, DISCHARGE SWITCH AND EVACUATED ACFT. PERFORMED COCKPIT CARGO COMP T FIRE TEST, OPS TESTED NORMAL. RAN APU AND APU PNEUMATICS FOR 30 MINS. NO PROBLEMS DETECTED, COCKPIT FIRE TESTED AGAIN NORMAL.