As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING START OF LEFT ENGINE, LEFT FIRE WARNING LIGHT ILLUMINATED. AS PER CHECKLIST, CREW SECURED ENGINE AND INITIATED SHOT ONE OF FIRE EXT SYSTEM. SHOT ONE POPPED CIRCUIT BREAKER. SHOT TWO SELECTED AND FIRED. REPLACED LEFT FIREWIRE CONTROL UNIT WHICH ACCOUNTED FOR THE FALSE INDICATION. UPON REPLACEMENT OF THE EXPENDED FIRE BOTTLE, CORRECTED MISWIRED FIRING CIRCUIT CONNECTIONS FOR BOTH LEFT FIRE PROTECTION CIRCUITS. (M)