What was found
AFTER TAKE OFF AT 400FT AGL, ALL 6 EFIS/EICAS SCREENS BLANK & CDU SCREEN BLANK 5 TO 10 SECONDS, ALL CAME BACK.(<P>PER MCC REQUEST, PERFORMED ENGINE RUNS FOR MIN 20-MIN. RAN ENGINES PER AMM 71-00-00. PERFORMED POWER TRANSFER REF AMM 24-22-00 COULD NOT DUPLICATE FAULT ON GROUND. A/C OK FOR SERVICE.</P>)