As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT ENGINE FIRE INDICATION DURING LEVEL OFF AT FL410. CREW RAN QRH AND MEMORY CHECKLIST AND REDUCED POWER TO CRUISE SETTING, FIRE WARNING EXTINGUISHED. INSPECTED ENGINE AND FOUND NO EVIDENCE OF FIRE OR BLEED AIR LEAK. MEASURED RESISTANCE OF TAILPIPE FIRE LOOP INDICATED AN ABNORMAL RESISTANCE. REPLACED FIRE LOOP WITH A SERVICEABLE LOOP.