As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 FMC FAILED AT FL 350 FOR APPROX. 20 SECONDS, VTK FLAG WAS DISPLAYED ON BOTH NAVIGATION DISPLAYS. 1 FMC RESTORED TO NORMAL AND VTK FLAGS WENT AWAY. ACFT GROUNDED. PERFORMED FIM 34-61 TASK 836 ON NR 1 & 2 FMCS. OPS CHECKED NORMAL, NO DEFECTS NOTED AT THIS TIME. GOOD FOR CONTINUED SERVICE.