As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DESCENDING THRU 3500 WE RECEIVED STRONG FUME EVENT ODOR IN C/P AND FWD CABIN. TURNED OFF PACK 1 ODOR STOPPED AFTER LANDING-DURING R/S ISOLATED BOTH PACKS AND FOUND PACK 1 TO BE THE SOURCE OF FUME EVENT REF. TSM 05-50-00-810-831-A SEE LP 2520417-1 FOR PACK 1 DIFFERAL