As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL350 CAPTAIN'S NAV DISPLAYED VTK FOLLOWED BY MAP FAILURE FLAGS. NO FMC DATA ON CAPTAIN'S NAV DISPLAY AND NO FMC DATA ON BOTH CDUS. RESTORED ITSELF IN 1 MINUTE. ACFT GROUNDED. PERFORMED BITE CHECK FMC SYSTEM IAW AMM 34-61-801, NO FAULT NOTED, ACFT OK FOR SERVICE.