As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHIP 8141 -ATB- RETURNED TO SEA DUE TO ODOR IN THE CABIN AND FLIGHT DECK. CREW DID DON O2 MASKS AND IS DECLARING AN EMERGENCY. CORRECTIVE ACTION: MTC FOUND OIL WETTING ON NBR 2 ENGINE FAN EXIT GUIDE VANES. #2 ENGINE REPLACED. (LP# 7215788, 0870339)