As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SATCOM INOP, QRH UNLOCK PROCEDURE NOT SUCCESSFUL. ACFT GROUNDED. PERFORMED FIM TASK 23-15-00-23-801. CYCLING OF SATCOM BREAKER NO HELP. FOUND NO SAT SELECTIONS ON BOTH MCDU'S. LEDS ON FRONT OF SATCOM TRANSCEIVER WERE OFF EXCEPT FOR "POWER" LED WHICH WAS SOLID GREEN. REMOVED, REPLACED AND TESTED IRIDIUM TRANSCEIVER REF MM23-15-00. OPS NORMAL.