As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SATCOM SYSTEM FAILS OR NO BUSS ACTIVITY. ADVISORY MESSAGE 2368893 ACTIVE ES HARD. REPLACED SATCOM DATA UNIT PCN 583-9200 PER MM, OP CHECKED FAIL DUE TO LNA-DIPLEXER HAS A FAULT MSG23-60091 OR FIM 23-15 TASK 807. COMPLETED STEP C OF THE FIM.