As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DUAL FMC FAIL. LEG PAGES BLANK ON BOTH CALLS. UNABLE TO ENTER ANY FIX LEGS ON BOTH CDU'S. RESET C/BS. BITE HISTORY ON BOTH CDU'S SHOW NO FAULTS. NO FMC FAILURES / LIGHTS. AS PRECAUTION REMOVED BOTH CDU, CLEAN FILTERS INSPECT CONNECTORS AND REINSTALL. CDU'S OPERATIONAL NORMAL.