As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF. LAVATORY SMOKE ANNUNCIATOR ILLUMINATED FOR FWD LAVATORY DURING QRH CHECKLIST, ANNUNCIATOR EXTINGUISHED. IN COCKPIT ODOR OF EVAPORATING OIL NOTED. TROUBLESHOOTING ACCOMPLISHED ON LP 610870 & 610871, LT ENG REPLACED IAW WO 279553. ENG RUNS ACCOMPLISHED.