As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
"FUME EVENT. MILD CHEMICAL ODOR ON DESCENT OUT OF 4000' FEET. ASKED FLIHT ATTENDENTS , NO SMELL IN CABIN. ABLE TO ISOLATE PACK 1 AND SMELL DISSIPATED.-PER CREW REPORT FOUND PACK #1 CAUSE ODER SMELL . SEE LOG PAGE 3364078-2 FOR DEFERRED PACK #1"