What was found
ON DESCENT LOW ALTS, FUMES FROM PACKS STRONG OILY, MUSTY SMELL, HURTS EYES & THROAT. ACCOMPLISHED TASK CARDS 26L00021001 & 26L00021001 FOUND RESIDUAL OIL AT APU INTAKE AT PLENUM SEAL. REMOVED RESIDUAL OIL & CLEANED PLENUM & INTAKE. NO FURTHER SMELL NOTED IN CABIN.