As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VTK APPEARS ON CAPTAIN'S ND INTERMITTENTLY AND NO 'FMC' PROMPT VISIBLE ON CAPTAIN'S MCDU AFTER LANDING. GROUNDED - YES. PERFORMED OPERATIONAL TEST OF THE FLIGHT MANAGEMENT COMPUTER SYSTEM PER B737-800 AMM 34-61-00-710-801. ALL CHECKS NORMAL. NO DEFECTS NOTED AT THIS TIME . OK FOR SVC.