As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LANDING, VTK INDICATION ON CAPTAINS ND, AND BOTH FMC CDU'S MISSING "FMC" ON THE MENU PAGE. ANOMALY IS "INTERMITTENT. GROUNDED - YES. CONFIRMED. RMVD & RPLCD L/H FMC REFB737-800 AMM 34-61-02. OPS NML PER SAME. ETOPS GND VERIFICATION TEST SUCCESSFUL.