As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT#327, DESCENDING THROUGH 12K FEET FLIGHT HAD A VERY NOTICEABLE DIRTY SOCK ODOR. ENGINES WERE AT FLIGHT IDLE FOR ABOVE 5 MIN WHEN THE ODOR STARTED ODOR WAS LESS NOTICEABLE AT LOWER ALTITUDE CREW WAS UNABLE TO ISOLATE WHICH PACKS IT WAS AIRBORNE; COMPLIED WITH INFORMATION NOTICE 2017-T015- SECTION A ISOLATED FAULT TO TYPE 10 (A) 1 C PER TSM 05-50-00-810-085-B TSM 05-50-00810-085D AIRCRAFT IS OK FOR SERVICE.