As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT FMC SHOWED SOME INDICATIONS OF FAILING. VTK FOLLOWED BY MAP FAILURE, ON THE CAPTAIN`S NAV DISPLAY. RESTORED ON ITS OWN AFTER ABOUT 10 SECONDS BEFORE ANY CORRECTIVE ACTION WAS TAKEN. SEEMS TO BE OPERATING NORMALLY SINCE. ACFT GROUNDED. PERFORMED FIM 34-61 TASK 836 WITH NO DEFECTS NOTED, AIRCRAFT OK FOR SERVICE.