What was found
FLT 524, LAX-JFK. STRONG FUMES ODOR ON ARRIVAL, AROUND 14,000 FT ALTITUDE, WHEN WE ENTERED THE CLOUDS. IT WENT AWAY BEFORE WE COULD DO A ISOLATION PROCEDURE. ODOR WAS IN THE BACK HALF OF MAIN CABIN, APU WAS FOUND LEAKING. ECS LEVEL C DECONTAMINATION. REPLACED BOTH RECIRCULATING FILTERS & OZONE FILTER 100HM, COMPLETED DECONTAMINATION IAW AMM 21-00-00-615-804-A. NO ODOR AT THIS TIME. OPEN