As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
KLAX - ON CLIMB-OUT, NR 3 ENGINE A/B FIRE DETECTION LOOP INDICATORS FLUCTUATED UP AND DOWN FULL SCALE. FIRE DETECTION LIGHT ON. REDUCED NR 3 THRUST LEVER, LIGHT EXTINGUISHED, LOOP INDICATIONS WENT TO NORMAL. FOUND NR 3 ENGINE FUEL COND MOTOR AND BOTH A/B LOOP WIRING CHAFING TOGETHER. REPAIRED WIRES. RAN ENGINE TO 1.31 EPR, SYSTEM CHECK NORMAL. (M)