What was found
DESCENDING THROUGH 10,000 FT. SMELLED A DIRTY SOCK AND MUSTY ODOR. TURNED OFF PACKS, BLEEDS & VENTILATED CABIN WITH RAM AIR. R & R DEOILER SEAL ASSY IAW AMM 72-60-31 ON THE RT AND LT ENGINES. R & R THE HEPA FILTERS IAW AMM 21-21-41. PERFORMED A PACK BURNOUT. NO ODORS AT THIS TIME. OPS CHECKED GOOD