As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NO COMM DISPLAYED ON ACARS DISPLAY UNIT OVER OCEAN. ACARS SENDS OK IN VHF RANGE. CREW COMMENTS: SATCOM CONSTANTLY REQUESTING LOGON. SAMC TEXT: MAINTENANCE REPORT SATCOM SYSTEM INOP HIGH & LOW GAIN. AFTER SAT AND ACARS SYSTEM RESET IDU SHOWS SATCOM ALWAYS IN SEARCH MODE WITH NO COMM DISPLAY. DEFERRED SATCOM AND PULLED CB HFSAT SATCOM AND SATCOM HG. REPLACED BOTH RADIO FREQ UNIT AND ALSO SATCOM DATA UNIT.