What was found
MOLDLY OLD SOCK SMELL AT LOW ALTITUDES AND HIGH POWER SETTINGS OPERATED APU AND PACKS. NOTICED THERE WAS A STRONG OIL ODOR THROUGHOUT CABIN AND COCKPIT. PERFORMED FIM TASK 05-51-26-800-801-C1, SMOKE/ODOR IN FLIGHT DECK/ CABIN. FOUND RIGHT RECIRCULATION FILTER DIRTIER THAN LEFT, BUT SEEMED LIKE NORMAL DIRT AND NOT OIL CONTAMINATION. REPLACED BOTH FILTERS PER A.M.M. 21-25-01. RAN ENGINES AT 70% N1 WITH PACKS ISOLATED ON EACH SIDE FOR 10 MINUTES. ISOLATED APU BLEED DURING COOL DOWN. NO ODORS NOTED. REINSPECTED RECIRCULATION FILTERS AND FOUND NO CONTAMINATION. AIRCRAFT OKAY FOR SERVICE.