As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 3598 - CMH - AFTER TAKEOFF, GOT LAV SMOKE LIGHT ON AND FA NOTED OIL SMELL IN AFT CABIN. CREW RETURNED TO CMH, LAV SMOKE LIGHT WENT OUT 3-5 MINUTES AFTER TURN BACK TO CMH. NO OTHER PROBLEMS NOTED. REMOVED AND REPLACED NR 1 ENGINE DUE TO INTERNAL OIL LEAK CAUSING ODOR. OPS CHECK AND LEAK CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE. (M)