What was found
IN CRUISE, RECEIVED CONTINUOUS CALL HORN W/ LIGHTS ON OVERHEAD PANEL: EMERGENCY RED LIGHT, EVERY CALL-ON SERVANT OVRD-ON. PA SYSTEM INOP, CIDS CAUTION LIGHTS ON FAP. HORN AND LIGHTS STAYED ON TILL MAINT TOOK OVER. REMOVED AND REPLACED FAP 120RH IAW AMM 23-73-12, ACCOMPLISHED AMM 23-73-00-740-005 TEST OK, NO FAULTS FOUND.