As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIRTY SOCK ODOR ON DECENT OUT OF 12000 THRU LANDING. USED OXYGEN MASK UNTIL JUST PRIOR TO LANDING. NO ODOR NOTED ON TAXI IN. #2 ENGINE DETERMINED TO BE SOURCE OF ODOR DUE TO EVIDENCE OF OIL IN FAN HUB. AIRCRAFT WAS GROUNDED. REMOVED LPT VENT SHAFT, REPLACED O-RINGS ON SHAFT RE-INSTALLED LPT VENT SHAFT. RAN #2 ENGINE AT 75% N1 FOR 15 MIN, NO OIL FOUND IN HUB. OK FOR SERVICE.