As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENGINE FIRE LIGHT CAME ON AFTER TAKEOFF. CREW PERFORMED A FULL SHUTDOWN, RETURNED TO THE FIELD AND LANDED WITHOUT ANY FURTHER INCIDENT. NO APPARENT FIRE. POST FLIGHT INSPECTION BY THE CREW DID NOT SHOW ANY TRACE OF FIRE. MAINTENANCE STILL INVESTIGATING.