As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
KMIA - TRIP NR 84655: ON DESCENT INTO KMIA, HAD INTERMITTENT FIRE WARNING NR 2 ENGINE. TROUBLESHOT SYSTEM, FOUND AFT OUTBOARD FIRELOOP SHORTED AGAINST COWLING. INSULATED AND PROPERLY SECURED LOOP. CHECKED SYSTEM OPERATION WITH ENGINE AT TAKEOFF POWER GOOD. SYSTEM OPS GOOD IAW DMM CHAPTER 26.