As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SATCOM APPEARS TO HAVE LOCKED UP. NO SATCOM SELECTION ON MCDU PAGE. ACFT GROUNDED. ACCOMPLISHED FIM 23-15, TASK 801. NO LOCK UP CONDITION PRESENT WITH NORMAL OPERATION IAW THIS REF, THERE'S A KNOWN PROBLEM WITH SATCOM EQUIPED PLANES HAVING THIS ISSUE.