As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
98-0001 FIRE WARNING LIGHTS AND BELL ON FOR 1 SECOND AT CRUISE, (ON FORWARD INSTRUMENT PANEL) NO FURTHER INDICATIONS. ENGINE INSTRUMENTS ALL NORMAL. FOUND PIN PUSHED BACK IN FIRE DETECTOR CONTROL UNIT REMOVED AND REPLACED UNIT OPERATIONAL CHECKED GOOD.