As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LANDING CAPTAIN ND DISPLAYED VTK FLAG. MCDU MENU PAGE FMC PROMPT BLANKED. THIS SEQUENCE REPEATED ITSELF NUMEROUS TIMES. FLAG WOULD APPEAR, THEN DISAPPEAR. GROUNDED - YES. REMOVED AND REPLACED #1 FMC PER B737-800 AMM 34-61-02. OPS CHECK NORMAL.