As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON DISARMING THE DOOR (CABIN) ON BLOCK IN, THE WARNING HORN WOULD NOT TEST. DEFERRED SLIDE WARNING BUZZER PER MEL 52-73-01-2 NO DMP REQUIED. PLACARD INSTALLED. M788685 ASSIGNED.REPLACED WARNING BUZZER PER SWPM 20-51-40. TEST NORMAL PER AMM 52-73-00