As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI IN AND AT GATE FMC INTERMITTENTLY BLANKS ON MCDU MENU VTK APPEARS ON CA'S AND WHEN FMC BLANKS. GROUNDED - YES. VERIFIED FAULT CYCLED C/B FOR FMC COMPUTER #1 NO HELP CYCLED A/C PWR L/H FMC STOPPED CYCLING ON AND OFF. ACCOMP FMC SYSTEM OPS TEST BOTH FMCS. BOTH PASS TEST. REF B737-800 AMM 34-61-00-710-801.