As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 8131 RETURNED TO SEA DUE TO DIRTY SOCK SMELL IN COCKPIT AND CABIN. CORRECTIVE ACTION: C/W W/C 0550-2001 & DETERMINED SOURCE TO BE #1 ENGINE. C/W W/C 0550-6001 AND W/C 0550-2003. FOUND NO EVIDENCE OF OIL CONTAMINATION. BOTH RECIRCULATION FILTERS REPLACED. (LP# 7557196)