As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NO VOICE ON SATCOM, SAT1 OR SAT2, WHEN PLACING CALL FROM FLIGHT DECK OR WHEN ANSWERING A GROUND TO AIR CALL. DISPATCH REPORTED HEARING PILOT TRANSMISSIONS, COULD NOT HEAR DISPATCH. ACFT GROUNDED. COULD NOT DUPLICATE. NO HISTORY 60 DAYS. OPS CHECK NR 1 & 2 SATCOMS GOOD IAW MM 23-15-00/801. RECEIVED VOICE IS LOUD & CLEAR.