As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#1573, EWR-LAX. "ON DESCENT NEAR 10000FT INFLIGHT SMELLED STRONG ODOR. DISSIPATED OVER TIME SMELL NEVER WENT AWAY. BRIEF FAINT SMELL IN COCKPIT; REF INFO NOTICE 2017-T015L AND TSM 05-50-00-810-831-A. FOUND OIL RESIDUE IN APU INTAKE PLENUM ACCOMP DECONTAMINATION AND R/R OF RECIRC FILTERS. RAN #1 & 2 ENGINES. NO ODER OPS CHECK NORMAL."