As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FMC 1 AND 2 BOTH RESET AT FL310 AND 20 MINUTES INTO FLIGHT. CYCLED FLIGHT DIRECTOR'S AND FMC'S 1 AND 2 RESUMED OPS. GROUNDED - YES. REF B737-9 IFIM TASK 34-61-00-810-836 PER FIM FAULT WAS INTERMITTENT NO ASSOCIATED FDE OR FAULTS. ALL REQUIRED TESTS PASSED.