What was found
INTERPHONE BETWEEN FLIGHT DECK AND CABIN INOPERATIVE PERFORMED OPS CHECK ON CABIN INTERPHONE SYSTEM IAW AMM REF. 23-42-00-710-801. COMMUNICATION BETWEEN FLIGHT DECK AND CABIN FUNCTIONS NORMALLY. OPS CHECK GOOD. NO FURTHER DEFECTS NOTED AT THIS TIME. UPON THE REMOVAL AND REPLACEMENT OF THE AUDIO CONTROL PANEL WITH FROZEN SETTINGS, FOUND CORRELATION BETWEEN ACP AND CABIN INTERPHONE SYSTEM. THE OPERATIONAL CHECK OF THE CABIN INTERPHONE SYSTEM FUCTIONED NORMALLY IRW LOG PAGE #6634819 WITH ADDITIONAL RESETTING OF ALL CABIN HANDSETS. COULD NO LONGER DUPLICATE ANY FAULTS.