As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAP AND VTK FLAGGED ON CAPTAIN`S ND. BOTH CDUS DISPLAYED NO INFORMATION. SWITCHED FMC TO BOTH ON RT BUT DUAL FMC OPS WAS NOT RESTORED. ACFT GROUNDED. REPLACED RT FMC REF AMM 34-61-02. OPS CHECK GOOD. SUCCESSFUL ETOPS GROUND VERIFICATION.