As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SATCOM SYSTEM SATCOM SYSTEM FAILS OR NO BUS ACTIVITY. STATUS MSG01- ACTIVE CLIMB HARD; SATELLITE DATA UNIT (LEFT) HAS NO OUTPUT ON ANY BUSS. MSG-2368801 ACTIVE CL HARD. FOUND LT SATCOM CB TRIPPED. REPLACED SDU. BITE TEST NORMAL. CONTACTED SAMC 777 CONTROLLER VIA SATCOM, ALL NORMAL.