As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SATCOM PROMPT DOES NOT APPEAR ON MCDU PAGE. ACFT GROUNDED. NOT ABLE TO GET SATCOM PROMPT TO DISAPPEAR. REMOVED AND REAPPLIED POWER AND TRANSFERRED POWER BETWEEN APU AND GROUND POWER. COULD NOT GET SATCOM TO FAIL REMOVED AND REPLACED SATCOM TRANSCEIVER. OPS NORMAL.