As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, CREW NOTICED BURNING ODOR AND MIST IN CABIN. PERFORMED EMERGENCY RETURN TO DEPARTURE. FOUND OIL STREAKING IN EXHAUST AND FOD IN COMPRESSOR SECTION. ON TEARDOWN, NR 2 BEARING CARBON SEAL WAS FOUND FRACTURED WITH FRAGMENTS OF THE SEAL HAVING MIGRATED INTO THE GAS PATH CAUSING FOD CONDITION.