As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EXHAUST COLLECTOR CONNECTION MOVED OUT OF POSITION AFTER TAKEOFF, ALLOWING EXHAUST GAS TO ESCAPE AND ILLUMINATE THE ZONE 1 FIRE WARNING. ENGINE WAS SHUTDOWN AND AIRCRAFT RETURNED TO DEPARTURE AIRPORT. AIRCRAFT RECEIVED NO DAMAGE AND REPAIRS WERE ACCOMPLISHED. (K)