What was found
DURING TAXI IN CAPTAINS NAV DISPLAY SHOWS VTK FLAG & BOTH CDU'S FMC SELECTIONS CARROTS DISAPPEAR. THIS CONDITION CYCLED ABOUT 8-10 TIMES DURING TAXI IN. GROUNDED - YES. PERFORMED RESET OF CB A6 & A7 ON P 18-2 PANEL AND RESET D 15 & 16 ON P 6-1 PANEL. PERFORMED FMCS BITE PROCEDURE TO TEST OK I A W B737-800 FIM 34-61 TASK 801. PERFORMED FMCS OPERATION TEST I A W B737-800 AMM 34-61-00-710-801. NO FAULTS NOTED. NO MX HISTORY LAST 90 DAYS. A/C OK FOR SERVICE.