What was found
INTERMITTENT PA STATUS MESSAGE, WHEN PA USED FROM CABIN. REPLACED THE PASSENGER ADDRESS CABIN INTERPHONE CONTROLLER IAW MM 23-39-03-401. QUICK TEST FAULTS SDM 2-6, M23036 LT CTR ROW 22 REPLACED SDM BUT STILL FAULTS ON QUICK TEST, SUSPECT SDM WAS BAD FROM STOCK. SUGGEST INSTALLING ANOTHER SDM M23036. PACI & MULTI SDM REPLACED. NOTE PTT 1122009 OPEN IN CIRCUIT NEVER ISOLATED OR CORRECTED. IAW WDM'S 23-31-31,32 & CHECKED ALL WIRING BETWEEN SDM'S 2-5,2-6,2-7,2-8, CONFIRM GOOD GND'S. REPLACED SDM M23037, 2-7 & M23042, 2-12 IAW MM 23-31-02-401, OPERATIONS CHECKED GOOD.