What was found
LAX FLIGHT NR 2470: ON DESCENT, FA ADVISED OF ODOR OF FUMES NEAR ROW 18. TURNED NR 2 BLEED OFF, NO CHANGE WITH BLEED NR 1 OFF AND NR 2 ON, ODOR DISSIPATED. MAINTENANCE INSPECTED NR 2 ENGINE AND FOUND NO DISCREPANCIES. RAN NR 1 AND NR 2 ENGINE. CYCLED ON NR 1 BLEED. NO ODOR OR FUMES NOTICED. CYCLED ON NR 2 BLEED WITH NO ODOR OR FUMES NOTICED. CHECKED OIL LEVEL WHICH WAS GOOD. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.