As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EVAC HORN INTERMITTENTLY SOUNDING WHILE ACFT AT GATE. NO JOY WITH RESET BUTTON ON F/A PANEL'S. PERFORMED SEVERAL RESETS OF THE SYSTEM AND PUT A/C BACK INTO SERVICE. THERE HAVE BEEN NO REPEATS OF THIS PARTICULAR ISSUE SINCE THE ORIGINAL.