As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUME EVENT. STRONG ODOR/CHEMICAL SMELL AT 2500' DURING APPROACH. PACK 1 OFF STOPPED SMELL. SMELL WAS IN COCKPIT. NO SMELL REPORTED IN CABIN.-PERFORMED TSM 05-50-00-810-831 RAN BOTH ENGINES + ISOLATED TO PACK #1. REF LP 2518956-1 FOR MEL