As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FIRE WARNING LIGHT ILLUMINATED & BELL SOUNDED FOR 1 SECOND IN DURATION. NO ASSOCIATED ENG, APU OR CARGO FIRE LIGHTS CAME ON. CLEANED CONNECTOR ON AURAL WARNING SPEAKER IAW SIP. R & R LT & RT RED FIRE WARNING 1864 BULBS IAW MM 33-11-81.