As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DESCENDING THROUGH FL260 AN ODOR SIMILAR TO DIRTY SOCK WAS NOTED IN THE COCKPIT. SMELL DISSIPATED WITH PACK 1 OFF-REF TSM 05-50-00-810-831-A. FOUND PACK 1 TO BE THE SOURCE. PERFORMED LEVEL B ECS DECONTAMINATION ON PACK 1 WITH ENG BLEED IAW AMM 21-00-00-615-803-A REF LP 3535481-2 FOR PACK 1 DEFERRAL