As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FMC 1&2 WENT OUT DURING PREFLIGHT AND WILL NOT RE-INITIALIZE. VERIFIED FAULT BOTH FMC 1&2 INOP PULLED CIRCUIT BREAKERS FOR FMC 1&2 MCDU AND COMPUTER RE-RACKED FMC 1&2 COMPUTERS RESET ALL CIRCUIT BREAKERS SYSTEM, OPS CHECK GOOD IAW MM 34 61 00.