What was found
DAU 2B MISCOMP CAS MESSAGE CYCLED THREE TIMES. STAYED ON THE THIRD TIME, ALL ENGINE INDICATORS, OIL, FUEL FLOW, FUEL QUANTITIES, ETC. FAILED DAU FAIL CAS MESSAGE CAME ON. THIS WAS FOLLOWED BY A STRONG BURNING ODOR. MESSAGES CLEARED TAXIING IN. REMOVED NR 2 DAU, PER CUSTOMER REQUEST REPOSITIONED NR 1 DAU P/N 7013348-943, S/N 96050518 TO THE NR 2 POSITION. INSTALLED NEW DAU IN THE NR 1 POSITION P/N 7013348-943, S/N 00053440, REF MM 31-41-00, OPS CHECKED SYSTEMS WITH NO DEFECTS NOTED AT THIS TIME. RE-INSTALLED BAGGAGE PNLS.