What was found
DEPARTED APF, APU OFF FOR TAKEOFF. LEVELED OFF AT 2000 FT PER CLEARANCE & NOTICED A HOT BURNING OIL ODOR, REDUCED POWER AT 2,000 FT TO KEEP A SLOW AIRSPEED, ODOR BEGAN TO EASE. VISUAL INSP SHOWED NO OIL ON ENG COWLINGS OR UNDER APU. OIL LEVELS CHECKED GOOD. RAN APU, NO ODOR NOTED, PERFORMED ENG RUN & SIGHT ODOR. REPLACED SOCK & ENG RUNS AGAIN. & ODOR SLIGHTLY OBSERVED AFTER LT ENG START. REMOVED DUCTS FROM WATER SEPARATOR & NOTICED ODOR. REMOVED BLEED DUCTS & CLEANED. FOUND NO OILY RESIDUE, SLIGHT ODOR. REINSTALLED BLEED DUCTS. CLEANED TIRE DUCT & PERFORMED BURN OUT PROCEDURE AGAIN, NO ODOR. PERFORMED DUCT BURN OUT, R & R WATER SEPARATOR CONDENSER BAG IAW AMM 21-51-00. NO DEFECTS NOTED.