As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SATCOM SYSTEM STATUS MSG. CHECKED MAT AND FOUND MAINT MSGS OF 23-69951 AND 23-68801. BOTHS FIM PROCEDURES REQUEST FOR SDU REPLACEMENT ON THE FIRST STEP. SDU PCN 583-9200 NIL AT GRUJL. CBS E17, E20 AND E21 PULLED OUT AND COLLARED PER MEL PROCEDURES. REPLACED SDU, OPS CHECKS GOOD.