As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NO SATCOM MENU DISPLAYED ON ACARS MENU PAGE. DISPATCH WAS UNABLE TO CONTACT THE ACFT THROUGH THE SATCOM SYSTEM. ACFT GROUNDED. VERIFIED NO SATCOM PROMPT. ACCOMPLISHED FIM TASK 23-15 TASK 801. PROMPT REAPPEARS. GROUND VERIFICATION GOOD.