As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MULTIPLE INTERMITTENT SINGLE AND DUAL FMC FAILURES IN FLIGHT, LASTING BETWEEN :20-1:00. ALWAYS SELF-RESTORED PRIOR TO QRH COMPLETION. GROUNDED-YES. PERFORMED B737-900 FIM 34-61 TASK 801 AND FIM 34-61 TASK 806. FMC'S RESET OK FOR SERVICE.