As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT FMC FAILURE. RAN CHECKLIST AND RESTORED RIGHT FMC'S THEN DUAL FMC FAILURE FOR ABOUT 3 MINUTES. BOTH FMC RETURNED BACK TO NORMAL. GROUNDED - YES. PERFORMED FMC 1 AND 2 SYSTEM TEST PER B737-800 FIM 34-61 TASK 836. OPS CHECK NORMAL.