As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW HEARD FORWARD LAVATORY FIRE DETECTOR GOING OFF AND A FEW SECONDS LATER RECEIVED A LAV SMOKE MESSAGE. F/A CALLED AND STATED THEY COULD SEE AND SMELL SMOKE IN THE CABIN. DECLARED AN EMERGENCY AND RETURNED TO DEPARTURE AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND FOUND OIL LEAKING FROM INSIDE COMPRESSOR AROUND THE NR 3 BEARING. MAINTENANCE R & R THE NR 2 ENGINE IAW AMM AND OPS CHECKED GOOD.