As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SATCOM SYSTEM FAULTS. REPLACE THE SDU.SATCOM GROUND TEST FAILS.SATCOM DOES NOT STAY LOGGED ON AND IS NOT AVAILABLE.SDU ORDERED FOR REPLACEMENT. REPLACED SATCOM RECEIVER TRANSMITTER, SATCOM OPS NORMAL, LINK TEST OK, NO CMC OR STATUS MESSAGES.