What was found
TAKEOFF +15 (+/- 5 MINUTES) WHILE AT INTERMEDIATE LEVEL OFF PER ATC, THE RIGHT FMC DISPLAY BLANKED FOR APPROXIMATELY 3-5 SECONDS. THEN DISPLAYED BIT PASS IN GREEN FONT, SOFTWARE IN BLUE FONT AND CUSTOMER IN YELLOW FONT ON A BLANK/BLACK BACKGROUND FOR APPROXIMATELY 5 SECONDS. THEN NORMAL DISPLAY RETURNED - THIS HAPPENED 4 TIMES DURING THE FLIGHT. THEN ND WAS NORMAL WITH NO FLAGS. ACFT GROUNDED. REBOOTED THE RT FMC & CDU IAW FIM 34-61, TASK 804. RT FMC & CDU OPS CHECK OK. RT FMC BITE TEST OK, IAW FIM 34-61, TASK 801.