As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DECENDING THROUGH 7500' UNTIL TOUCHDOWN A VERY PUNGENT ODOR COMING FROM PACKS ONLY ON DESCENT SMELLED SIMILAR TO OLD GYLCOL - RESOLUTION: PERFORMED FIM TASK 21-00 TASK 806 NO DEFECT NOTED RAN AC COOLING PACKS WITH NO ODOR SMELL PRESENT AT THIS TIME