As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SATCOM LOCKED UP ON GROUND, MISSING SAT SELECTION ON MCDU MENU PAGE AND NO SATCOM PAGES AVAILABLE. AFTER A MOMENTARY DELAY, SAT PROMPT WAS DISPLAYED. THIS OCCURRED DURING POWER TRANSFER FROM GROUND POWER TO APU POWER. ACFT GROUNDED. OPS NORMAL.