As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE: EVACUATION WARNING HORN NOT SOUNDING AT DOOR 2 AND 4. MAINTENANCE REPLACED THE LOUD SPEAKER AT THE 2R DOOR AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 23-73-51. THE EMERGENCY EVACUATION WARNING HORN IS OPERATING AT DOOR 2 AND 4 WITH NO ISSUES NOTED.