As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOLLOWING ELECTRICAL TRANSFER FROM JETWAY TO APU POWER, NOTICED MISSING SAT SELECTION ON THE MCDU MENU PAGE AND NO SATCOM PAGES AVAILABLE. APPLIED QRH SATCOM LOCKUP PROCEDURE. NORMAL SATCOM OPS RESTORED. ACFT GROUNDED. INSPECTED MCDU AND FOUND SATCOM PROMPT ON LEFT AND RIGHT SIDE PRESENT. PERFORMED SYSTEM OPS CHECK, REF B737-900 AMM 23-15-00. CHECKS NORMAL.