What was found
UPON TURNING ON THE APU BLEED, THE OUTPUT TEMPERATURES WERE APROX 130 DEGREES AND A VERY STRONG BURNING SMELL WAS NOTED IN THE FLIGHT DECK THAT DID NOT DISAPATE UNTIL THE APU BLEED WAS SELECTED OFF AND COCKPIT WINDOWS WERE OPENED. C/A: COMPLETED WORK CARD 0550-2002, NO EVIDENCE OF OIL UNDER BLACK LIGHT OR INSIDE BLEED DUCT APU SUSPECTED AS MOST LIKELY SOURCE AND WILL BE PLACED ON MEL ON LOGPAGE 503261. PERFORMED PACK BURNOUT PER AMDS CARD 2100-2003. REPLACED CABIN FILTERS. ALL STEPS OF NO-GO ODI PREVENTION ATA 2172 ACCOMPLISHED MCC ADVISED, OK FOR SERVICE.