As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUMES NOTICEABLE DURING DESCENT, CHKLIST FOR ODOR IN FLIGHT DECK IAW QRH, NR 1 PACK OFF WHEN TURNED BACK ON ODOR WAS WORSE. ACFT WAS GROUNDED AS A RESULT. T/S IAW TSM 05-50-00-810-831-A, DETERMINED NR 1 ENG TO BE THE SOURCE. C/S LEVEL C DECONTAMINATION IAW AMM 21-00-00-615-804-A INSP BLEED DUCTS NO CONTAMINATION NOTED. PERFORMED IDLE RUN NR 1 ENG NO ODOR PRESENT DURING ENG BLEED OPERATION IAW TSM 71-00-00-810-847-A. ACFT OK FOR SERVICE.