What was found
PASSING THRU APPROX. 9000 FT, THE CREW NOTICED A STRONG ODOR LIKE DANK, DIRTY SOCKS, THROUGHOUT THE CABIN AND FLIGHT DECK. ENGINE AND ALL OTHER INDICATIONS WERE NORMAL THE ODOR WAS MUCH STRONGER IN THE AFT CABIN. THE ODOR DISSIPATED DURING TAXI IN. APU & BOTH ENGINES PNEU SYSTEMS RAN WITH NO RESIDUAL ODOR. REPLACED BOTH RECIRCULATION FILTERS. NO OIL CONTAMINATION OR ODOR IN ANY PART OF THE CABIN .