As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DESCENDING FROM 4000 FT AND SPEED 210 KIAS, A DIRTY SOCK ODOR. AT 2000 FT. SELECTED PACK 1 OFF AND THE ODOR WENT AWAY GRADUALLY. HAPPENED RIGHT AFTER SELECTION OF FLAPS 2 AND ACFT PITCH ATTITUDE CHANGED. COMPLIED WITH INFORMATION NOTICE 2017-T015B SECTION A. ODOR DETERMINED TO BE LEVEL 1 CONDITION. AIRCRAFT IS OK FOR SERVICE.