What was found
AIRCRAFT NOT GROUNDED: PILOT REPORTS FOR APPROX 5 MINUTES IN FLIGHT, BOTH PILOT NDS AND LOWER DU WENT BLANK. NO PANEL SWITCHING CHANGED ANYTHING. COULD NOT DISPLAY HYD PRESSURES ON ANY DISPLAY. THERE WERE NO EEC LIGHTS. ON UPPER DU, ONLY N1 AND EGT WERE DISPLAYED. NO MESSAGES WERE DISPLAYED ON PFDS. MAINTENANCE REPORTS PER MAINT MSGS 31-60041, DEU-1 SOFTWARE RESET, AND 60042, DEU-2 SOFTWARE RESET, ACCOMPLISHED DEU 1 AND 2 SELF TEST PER FIM 31-62-00. ALL TESTS PASSED, DISPLAYS SHOW NO FAULTS.