As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SATCOM 1 AND SATCOM 2 EITHER DROP CALL OR ARE UNABLE TO INITIATE COMMUNICATION. SHOWING SATCOM, VOICE UNAVAILABLE, MESSAGE ON THE BOTTOM OF SATCOM MENU PAGE 1 MOST OF THE TIME. ACFT GROUNDED. COULD NOT DUPLICATE PROBLEM. SATCOM 1 & 2 OPS NORMAL IAW AMM 23-15-00, GOOD RECEIVE AND TRANSMIT OBTAINED WITH DISPATCH.