As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE NR 2 FIRE WARNING LIGHT AND BELL ILLUMINATED AND SOUNDED PERIODICALLY AT BEGINNING OF DESCENT - IDLE POWER SETTING. LIGHT AND BELL COULD BE CANCELED. ENGINE OPERATION WAS NORMAL. INSPECTED ALL DUCTING OK. SECURED LOOSE WIRING AND BRACKETS AT VARIOUS POINTS AND CHECKS OK.