What was found
(AIRCRAFT NOT GROUNDED) DIRTY SOCK SMELL DESCENDING THROUGH 15,000 FT, APU WAS OFF. BOTH PACKS WERE ON. / C/W TASK CARD A32X-21-000-001, FOUND APU INLET W/ OIL RESIDUE. C/W AMM 21-00-00-615-802-A, NO ODORS USING ENGINE BLEED. REF AML 2212202 FOR DEFERRAL OF APU, REF AML 2210894 FOR M313 TO C/W TC A32X-21-000-002."