As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW GND CHECK MIC ITEM 31225556. EVAC SWITCH AT 4L, SWITCH WILL NOT ENGAGE & HORN INOPERATIVE. L4 DOOR ATTENDANT PANEL ASSEMBLY REPLACED. INSTALLATION TEST FOUND NORMAL & EMER EVACUATION SIGNAL SYS OPERATIONAL TEST FOUND NORMAL IAW AMM 33-22-06 & AMM 25-63-02.