As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF LAVATORY SMOKE WARNING AND EICAS MESSAGE. EMERGENCY DECLARED. NORMAL LANDING AND NOT OVERWEIGHT. CREW INSPECTED LAVATORY FOR SMOKE NO PHYSICAL SMOKE FOUND. REPLACED NR 2 ENGINE AND PERFORMED A SUCCESSFUL FCF. ENGINE P/N OFF/ON AE3007A1, S/N OFF CAE 312810, S/N ON CAE 311496. AIRCRAFT RETURNED TO SERVICE. (M)