As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUME EVENT PASSING THROUGH 10K IN DESCENT. RAN FUME ELIMINATION CHECK LIST. PACK#1 OFF FUMES DISSIPATED-RAN BOTH PACK 1 ON APU BLEED. FOUND PACK ONE TO BE SOURCE OF SMELL. RAN BOTH ENGINES NO SIGN OF SMELL. REF. LP 3385185-2 FOR DEFFERAL OF PACK 1 IAW AMM 21-21-00.