As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UNABLE TO ESTABLISH SATCOM COMMUNICATION ON EITHER SAT1 OR SAT2. CALLS MADE AND ANSWERED AS INDICATED BY SATCOM COMPONENTS AND MCDU, BUT NO SIDE TONE OR VOICE COMMUNICATION POSSIBLE. ACFT GROUNDED. ACCOMPLISHED SATCOM COMM SYS TEST REF MM 23-15-00. OPS NORMAL, NO HISTORY 90 DAYS.