What was found
DURING PRESTART PROCEDURE OF APU WITH BATTERIES AND EICAS ON MULTIPLE EICAS MESSAGES STARTED APPEARING (PRI-STAB, SECONDARY STAB FAIL, DAU, FADEC FAILS) ANY MESSAGE ASSOCIATED WITH ELECTRICAL, RED CHECK RED ON TOP. A STRONG BURNING SMELL WAS ALSO NOTICED, BATTERIES WHERE DISCONNECTED. ITEM IS UNDER INVESTIGATION.