As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TYS A/C WAS EN ROUTE FROM EWR TO TYS WHEN SMOKE AND FUMES WERE SEEN IN THE CABIN AND THE LAV SMOKE DETECTOR ALARM WENT OFF. A/C RETURN TO EWR AND MAINTENANCE TROUBLESHOT THE SMOKE TO THE NR 2 ENGINE. A/C WAS FERRIED TO TYS WHERE THE NR 2 ENGINE WAS CHANGED AND OPS CHECK GOOD AFTER TASKCARD 21-20-00-100-805-A WAS COMPLIED WITH. A/C WAS RELEASED TO SERVICE. ALL WORK WAS COMPLIED WITH IAW 145XR AMM 7100-00-00. LEAK CHECKS GOOD.