As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LANDING AND ALL DURING TAXI IN, THERE WAS AN INTERMITTANT "VTK" ANNUNCIATOR ON CAPTAIN'S NAV DISPLAY AND COINCIDING LOSS OF "FMC" PROMPT ON BOTH CAPTAINS AND FO'S MCDU'S. GROUNDED - YES. PERFORMED FMC RESET IAW FIM 34-61 TASK 836. OPS CHK OK. NO DEFECTS NOTED. AC OK FOR SVC.