As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EN ROUTE TO PHX, BOTH LEFT FIRE LIGHTS ILLUMINATED. SHUT DOWN ENGINE AND SECURED AS PER EMERGENCY CHECK LIST. FOUND LEFT OIL COOLER FIRE DETECTION PROBE TO BE ACTIVATING AT TOO LOW A TEMP, GIVING A FALSE FIRE INDICATION. REPLACED FAULTY PROBE AND FIRE BOTTLE ASSY WITH SERVICEABLE UNITS. OPS CHECKS GOOD ON THE GROUND.