As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN CRUISE, THE CREW REPORTED THAT THE LAVATORY SMOKE DETECTOR WENT OFF AND THAT A STRONG SMELL WAS COMING FROM PACK NR 2. INITIALLY, THE NR 2 PACK WAS DEFERRED AND THE SMOKE DETECTOR WAS OPERATIONALLY CHECK GOOD. THE DEFERRAL WAS CORRECTED WHEN MAINTENANCE REMOVED AND REPLACED THE NR 2 ENGINE FOR LEAKING OIL INTERNALLY WHICH WAS CAUSING THE SMELL AND POSSIBLY THE SMOKE.