As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF AT 1500 FEET LAVATORY SMOKE WARNING ON EICAS. RETURNED TO KCMH. FLIGHT ATTENDANT REPORTED SMOKE IN LAST 3 ROWS. ACCOMPLISHED FIM ASK 21-20-00, FOUND SMALL AMOUNT OF DEICING FLUID AT NR 2 ENG AIR INLET. CLEANED AS REQUIRED, RUN ENG IAW ETN-EM-72-034. NO SMOKE& NO WARNING, OPERATIONS CHECKED GOOD. REMOVED AND REPLACED NR 2 ENG IAW 71-000-00. ALL LEAK AND OPS CHECKS GOOD.