What was found
COULD NOT DETERMINE SOURCE OF SMELL. STARTED WHEN WE SWITCHED TO ENGINE BLEED AFTER TAKEOFF. CONTINUED WHEN WE WENT BACK TO APU AIR. CORRECTIVE ACTION: RAN ENGINES AND APU FOR OVER 60 MINUTES AT IDLE AND HIGH-POWER. OPERATED AIR-CONDITIONING SYSTEM USING APU BLEED AIR AND 10TH STAGE BLEED AIR CYCLING BETWEEN THE 2 SOURCES AND USING AUTOMATIC AND MANUAL MODED. NO SMELL COULD BE DETECTED BETWEEN EITHER AIR SOURCE AT THIS TIME. WORKE DONE IN REF CL 650 AMM CH 71-00-00-866-807.