As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 434 - EN ROUTE PHX-DFW - LEFT ENGINE FIRE INDICATION WARNING CAME ON. COULD NOT SILENCE FIRE WARNING WITH BUTTON. SHUT ENGINE DOWN AND FIRE WARNING STOPPED. LANDED DFW WITHOUT INCIDENT. REPLACED LEFT ENGINE FIRE DETECTOR AMPLIFIER A2-7 AND LEFT ENGINE FIRE DETECTOR LOOP. ACCOMPLISHED CHECKS OF LEFT ENGINE FIRE WARNING SYSTEM. SYSTEM GROUND CHECKED NORMAL OPERATION. (M)