As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT LANDED DUE TO FIRE WARNING ON LEFT ENGINE. FOUND OUTBOARD EXHAUST TUBE CLAMP CAME LOOSE AND EXHAUST TUBE WAS HANGING FROM TURBOCHARGER. REINSTALLED TUBE AND GASKET AND TIGHTENED CLAMP AND SAFETY. OPS CHECKED GOOD, NO FIRE WARNING LIGHT.