What was found
ON FINAL, HI-LOW CHIME HEARD IN FLIGHT DECK AND CABIN, NOT TRIGERRED. AFT F/A EMERGENCY LIGHT IS NOW ON ALL THE TIME BUT DIMLY LIT. ATTEMPTS TO USE EMERGENCY CALL FROM ALL PILOT & F/A STATIONS DOES NOT TRIGGER THE THE HI-LOW CHIME. THE LIGHT FLASH RED AS NORMAL. ALL OTHER INTERPHONE, PA, CHIMES WORK NORMALLY. REMOVED AFT F/A HAND SET IAW 23-31-11-000-801 INSTALLED NEW UNIT IAW 23-31-11-400-801 C/W OPS TEST IAW 23-31-00-710-801 OPS TEST GOOD.