As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IND/PIA - IN-FLIGHT, THE LEFT ENGINE FIRE WARNING LIGHT CAME ON. THE FLIGHT CREW ACCOMPLISHED THE EMERGENCY CHECK LIST AND LANDED WITHOUT ANY OTHER PROBLEMS. AFTER TROUBLESHOOTING, THE MECHANIC FOUND A BAD FIRE WARNING LOOP. THE SYSTEM CHECKED GOOD IAW THE FOKKER MM AFTER THE LOOP WAS REMOVED AND REPLACED.