As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MUSTY VINEGAR SMELL IN CABIN DURING DESCENT AT 10,500FT. PASSENGERS FROM COMFORT PLUS TO THE LAST ROW IN MAIN CABIN NOTICED THE ODOR. ODOR WENT AWAY WITHIN 10 MINUTES. FOUND MINOR PUDDLE OF OIL ON NR 2 ENGINE. REPLACED FAN SHAFT COVER SEAL OUT OF PRECAUTION AS PER AMM 72-15 LEAK CHK OK. PERFORMED LVL A DECONTAMINATION OF THE ECS IAW AMM 21-00-00-615-802-A. (LP 9499122, 1771459 - AIRCRAFT WAS GROUNDED)