As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED A LAV SMOKE EICAS MESSAGE FOR 2 MINUTES THEN WENT AWAY. NO INDICATION OF FIRE OBSERVED BY THE F/A. MAINTENANCE INSPECTED AND RAN BOTH ENGINES. FOUND NR 2 ENGINE MAKES SMOKE IN THE CABIN THRU BLEED NR 2. THE NR 2 ENGINE WAS REPLACED AND OPERATIONAL CHECKS WERE GOOD.