As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER PUSH BACK CAPTAIN FMC FAILED. RAN QRH, THE CAPTAIN'S NAVIGATION DISPLAYE SHOWED "VTK" AND THERE WAS NO FMC DATA ON EITHER CDU. GROUNDED - YES. REMOVED AND REPLACED #1 FMC COMPUTER REF B737-800 AMM 34-61-02, OPS CHECK NORMAL PER SAME. SEAMC NOTIFED "JARED" FOR WORK ON CRITICAL SYSTEMS.