As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IFR FLIGHT, WHILE LEVEL AT 6000 FT, NR 2 ENGINE FIRE WARNING ACTIVATED. BEFORE EMERGENCY PROCEDURE STARTED, LIGHT AND AUDIO EXTINGUISHED. RETURNED TO DEPARTURE AND NR 2 ENGINE FIRE WARNING ACTIVATED BRIEFLY AGAIN. MX REPLACING RT NR 2 FIRE DETECTOR AND HARNESS.