As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SATCOM UNABLE TO TRANSMIT VOICE. RECEIVE VOICE AND CHIMES OK. ACARS OK THROUGH SATCOM. ACFT GROUNDED. ACCOMPLISHED SATCOM COMMUNICATION TEST AT SATCOM POSITION 1 HF/SAT OUTGOING CALL VOICE TEST. SYSTEM TEST NORMAL COMMUNICATION WITH DIALED PARTY TRANSMITS CLEAR IAW AMM 23-15-00730 A-VOICE TEST.