As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DESCENDING THRU 18000FT MSL STRONG DIRTY SOCK SMELL. ENG OIL SMELL WHILE DESCENT SO MASKED WERE WORN FROM 17800 TO AT GATE STILL SMELLED AFTER PULLED IN GATE AND ENG SHUTDOWN WAS ONLY IN COCKPIT. FOUND OIL WETTING UNDER NUM 1 ENG SPINNER. PERF W/C 7100-2018-1. CLEANED OIL WETTING AND RAN NUMBER 1 ENGINE. UTILIZED P-TRAK INITIAL RESULTS SENT TO MCC. PERF LEVEL B DECONT OF ECS PER AMM 21-00-00-615-803-A USING ENGINE. REPLACED BOTH RECIRC FILTER. (LP 8186162 - AIRCRAFT WAS GROUNDED)