As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE NR 4 DISPLAY UNIT WAS IDENTIFIED AS FLASHING ON AND OFF. THE DISPLAY UNIT WAS IDENTIFIED AS THE CAUSE OF THE FAULT AND WAS REPLACED. A SATISFACTORY OPERATIONAL CHECK OF THE FLIGHT DISPLAY SYSTEMS WAS ACCOMPLISHED AND AIRCRAFT WAS RELEASED FOR CONTINUED SERVICE.