As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF, RECEIVED A LAVATORY SMOKE INDICATION ON EICAS. F/A VERIFIED SMOKE COMING FROM LAVATORY. RETURNED AND LANDED WITHOUT INCIDENT. FIRE DEPT. INFRARED IMAGING LOCATED HOT AREA IN FLOOR OF CARGO BAY TO FLOOR OF LAVATORY. MAINTENANCE FOUND RT ENGINE TO BE AT FAULT. REPLACED THE RT ENGINE. OPS AND LEAK CHECKED GOOD WITH NO FURTHER DEFECTS NOTED.