As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL330 NR 2 ENGINE FIRE WARNING SOUNDED. PULLED T-HANDLE. DECLARED AN EMERGENCY AND DIVERTED TO CLT. NO EVIDENCE OF FIRE FOUND. FOUND CHAFED IDG FEEDER CABLE ONTO FIRE LOOP WHICH ARCED AND DAMAGED FIRE DETECTOR CONTROL UNIT. REPLACED FDCU, LOOP, AND FEEDER HARNESS.