As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI CREW RECEIVED A FIRE INDICATION ON THE LT ENGINE. THE ENGINE WAS SHUTDOWN AND THE FIRE EXTINGUISHING SYSTEM WAS ACTIVATED AS A PRECAUTION. CREW VISUALLY VERIFIED NO VISIBLE FIRE. FLIGHT RETURNED TO GATE UNEVENTFULLY PASSENGERS WERE DEPLANED AT GATE. MAINTENANCE PERSONNEL VERIFIED NO FIRE WAS PRESENT AND FOUND THE ENGINE FIRE WIRE WAS PROVIDING A FALSE FIRE INDICATION. THE FIRE WAS REMOVED AND REPLACED. A SATISFACTORY FUNCTIONAL CHECK WAS PERFORMED AND AIRCRAFT WAS RELEASED FOR CONTINUED SERVICE.