What was found
FLT#1520, ATL-JFK,"DIRTY SOX ODOR ON DESCENT THROUGH 10.000 DISSIPATED WHEN PACK 2 SELECTED OFF; REF INFO NOTICE 2017-T015L AND TSM 05-50-00-810-831-A. NO PHYSICAL EVIDENCE OF OIL FOUND IN APU. ACCOMPLISHED BLEED ISOLATION PROCEDURE OF ENG #1, ENG #2, APU PACK 1+2 INDIVIDUALLY, NO ODOR NOTED. ACCOMPLISHED LEVEL B ECS DECONTAMINATION IAW AMM 21-00-00-615-801 AND R/R RECIRT FILTERS IAW AMM 21-21-00. OPS CHK/LEAK CHK GOOD. NO ODOR NOTED. A/C OK FOR CONT SVC"