As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LANDING FMC PAGE BLANKED ON BOTH CDU'S. WITH MENU PAGE SELECTED, FMC PROMPT APPEARS FOR 10 SECONDS THEN BLANKS FOR 25 SECONDS AND REPEATS THE CYCLE. VTK APPEARS ON CAPTAIN'S NAV DISPLAY WHEN FMC DISAPPEARS FROM CDU'S. ACFT GROUNDED. PERFORMED B737-800 FIM 34-61 TASK 804. FMC PROMPT SHOWS ON MENU PAGE AND NO BLANKING NOTED. OK FOR SERVICE.