What was found
AT ROTATION, DAU1A FAILURE MESSAGE WITH LOSS OF ALL ENGINE 1 AND APU PARAMETERS AND ASSOCIATED COMPONENTS WITH 115VAC BUSS OFF MESSAGE FOR 5 MINUTES AND CAME BACK ON MOMENTARILY AND CYCLED BACK OFF. R & R THE NR 1 DAU, IAW AMM 31-41-01. NO FAIL MESSAGES WERE PRESENT WHEN PERFORMING MX. INSPECTED DAU1 ELECTRICAL CONNECTOR NO DEFECTS NOTED. REPLACED DAU1 AT THIS TIME AS PRECAUTION. OK FOR SERVICE. OPERATIONS CHECK GOOD.