As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL350 VTK ILLUMINATED ON NR 1 MAP DISPLAY AND BOTH FMC'S WENT BLANK THEN TO MENU. AFTER APPROXIMATELY 1 MINUTE SYS WENT BACK TO NORMAL AND OPERATED NORMALLY. ACFT GROUNDED. LEFT FMC FAULT LOGGED IN FLT, LEG 6 ONLY. ACCOMPLISHED LT FMC GROUND VERIFICATION TEST REF AMM 34-61-00, TEST PASSED.