As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLE FLIGHT 2488 - THE CREW REPORTED A LAV SMOKE WARNING INDICATION DURING CLIMB. THE AIRCRAFT RETURNED TO CLE AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND REPLACED THE NR 2 ENGINE. OPERATIONAL CHECKS WERE GOOD. THE PRIMARY FAILURE/REASON FOR REMOVAL WAS OIL LEAKING PAST NR 4 CARBON SEAL ASSEMBLY ALLOWING OIL TO ENTER THE CORE FLOWPATH AND CAUSE OIL SMELL IN THE CABIN.