As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR RETURN, DUE TO LT ENGINE SHUTDOWN. CREW REPORTED LOUD BANG FOLLOWED BY SMOKE IN THE COCKPIT AND OIL PRESSURE AND QUANTITY DROPPED TO ZERO. MAINTENANCE REPORTS CORE COWLS WET WITH OIL AND ZERO QUANTITY ON EICAS. ENGINE CHANGED AND DUCT BURNOUT PERFORMED.