As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUME EVENT ON DESCENT ISOLOTED PACK 1 SNARP CHEMICAL FUME ODOR-DEBRIEFED FLIGHT CREW AND VERIFIED PACK 1 AT FAULT ODOR DISIPATED WHEN PACK ISELECTED OFF INSPECTED APU AND BOTH ENGINES NO OIL LEAKS OR DEFECTS FOUND. RAN APU WITH PACK 2 ON ODOR NOTED BY MX OR FLIGHT CREW REF TSM 05-50-00 SEE LOG PAGEN 2570925-2 FOR PACK DEFFERAL.