As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLE FLIGHT 300 - THE CREW REPORTED A LAV SMOKE WARNING AFTER TAKEOFF. THE AIRCRAFT RETURNED TO CLE AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND REPLACED THE NR 1 ENGINE. OPERATIONAL CHECKS WERE GOOD. TEAR DOWN REPORT SHOWED THAT LEAKAGE WAS FOUND FROM THE COOL FRONT SUMP ON THE NR 1 ENGINE.