As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 ENGINE FIRE DETECTION FAIL MESSAGE DURING TAKE OFF. DURING RUN UPS. PERFORMED WIRING CHECKS OF THE FIRE DETECTION SYSTEM. NO DEFECTS NOTED. PERFORMED ENGINE RUN AT HIGH POWER SETTING. ENGINE RUN TESTED SATISFACTOR. ON INSPECTION OF FIRE LOOP, FOUND THE MOUNTING CLAMP DISCONNECTED.