As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOTH FMC'S WENT OFF-LINE AFTER LANDING FMC PROMPT CAME BACK UP DURING TAXI IN. GROUNDED - YES. L AND R FMC LOGGED "PGM FAULT". PERFORMED FIM 34-61 TASK 807, CYCLED 2 CB'S. OPS NML PER SAME. NO HISTORY LAST 30 DAYS. ETOPS GROUND VERIFICATION TEST NML, REF FIM 34-61 TASK 801.