What was found
APU DID A NORMAL START. WHEN THE BLEED AIR WAS TURNED ON, IT DETECTED A FUNNY ODOR AND FILLED THE CABIN WITH SMOKE. SUSPECT LT ENGINE INTRODUCTED OIL INTO THE A/C SYSTEM, LT ENGINE WAS CHANGED FOR HIGH GEARBOX OIL PRESSURES, INSPECTED WATER SEPERATOR AND SILENCER DUCT ON B INSPECTION, NO DISCREPANCIES NOTED, RAN APU AIR FOR APPROX. 3 PLUS HRS. NO ODOR NOTED.