As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EWR---CO4187 CREW REPORTED SMOKE IN COCKPIT AND AIRPLANE. DECLARED EMERGENCY AND RETURNED TO EWR. AIRCRAFT LANDED UNEVENTFULLY. MAINTENANCE TROUBLESHOOTING FOUND NR ENGINE LEAKING OIL AT BOTTEM OF FAN, SUSPECT ZERO BEARING. RAN BOTH ENGINES AT POWER, NO SMOKE NOTED. AIRCRAFT BEING MAINTENANCE FERRIED TO TYS FOR ENGINE CHANGE.