As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DIRTY SOCK ODOR IN COCKPIT ON DESCENT WITH POWERS AT IDLE. DISSIPATES WHEN THRUST COMES BACK IN. FA'S DID NOT SMELL ANY ODOR INTHE CABIN. MAIBNTENANCE REPLACED OIL COOLING FAN PER JC 26L000021002 AND AMM 49-52-51.