As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FIRE DETECTION LOOP FAULT CAS: DURING FLIGHT AMBER CAS "FIRE DETECTION LOOP FAULT" AND FIRE DETECTION, LEFT, LOOP A, FAULT ILLUMINATED. FOLLOWED QRH PROCEDURE. REPEAT WRITEUP // SIGN OFF // REMOVED AND REPLACED L/H FIRE DETECTION CONTROL UNIT IAW GULFSTREAM G450 AMM 26-15-01. PERFORMED ADJUSTMENT TEST OF FIRE DETECTION UNIT IAW GULFSTREAM G450 AMM 26-15-01. SYSTEM OPS CHECK GOOD, NO DISCREPANCIES NOTED AT THIS TIME. THIS CLEARS MEL.