As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WEIRD CHEMICAL SMELL COMING FROM COCKPIT ON DESCENT. PERFORMED WITH ENGINE BLEED 1 AND 2. OC SAT. RAN PACK SYSTEM DURING HIGH POWER RUN ON FULL HOT AND FULL COLD. ENGINES AND PACKS WERE ON TOTAL TIME OF 40 MINUTES. NO DEFECTS OR SMELL WERE NOTED.