What was found
DURING CRUISE FLIGHT, IDS DU STATUS MESSAGE, WITH MOMENTARY CAP ND BLANK 30 MINUTES, LATER MSG ERASED, BOTH EVENTS CONTAIN ELECTRICAL BURNING ODOR IN COCKPIT, NO RETURN; AFTER 30 MINUTES AND WORKED NORMALLY,MSG 31186 FOUND UPON ARRIVAL CAPT ND WORKS NORMAL, INSPECTED CAPT'S ND DU AND COOLING SCREEN, NO FAULT FOUND, AS PRECAUTION SWAPPED CAPTAIN`S DISPLAY UNIT WITH LOWER EICAS DISPLAY UNIT BOTH OPERATE NORMAL IAW MM AND NOT EVIDENCE OF BURNING.