What was found
FLT CREW REPORTS ACARS NOT WORKING, REPORTS CPDLC INOP. ACP DCMF SYS TEST, AMIS OPS TEST IAW AMM 23-27-00-740-801, 31-41-00- 710-801. HUI REPLACED LEFT AIMS M001 MODULE & OPS TEST CHEKED OK. R & R RT M001 MODULE, INSTALLED SOFTWARE, OPS CHECK GOOD. REF AMM 31-41-02-400-801. R & R SDU, UPDATED SOFTWARE, GROUND TEST PASSED. REF AMM 23-15-10-400-801. FOUND SATCOM SDU FAULT BEFORE & SDU OK AFTER REPLACEMENT . DCMF FUNTION SYSTEM OPS TEST CHECKED OK IAW AMM TASK 23-27-00-740-801 & CPDLC/ADS-C - OPS TEST CHECKED OK IAW AMM TASK 23-27-00-710-801-C1.