What was found
FUMES DURING DECENT THRU 8000 FT, F/A REPORTED A BURNING ODOR OF OIL. PERFORMED DECONTAMINATION OF THE ECS, CAN NOT DUPLICATE ODOR ON GROUND. CHECKED APU BLEED AIR DUCT, NO OIL CONTAMINATION FOUND IAW TSM 05-50-00-810-831A, & AMM 21-00-00-615-002A/004A.