As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CUSTOMER REPORTED FIRE ALARM IN THE LAVATORY. LIGHT OIL SMOKE WAS VISIBLE IN THE CABIN. MX WAS CALLED UPON FOR TROUBLESHOOTING. OIL WAS FOUND ALL THE WAY FROM REAR INLET CASE TO EXHAUST DUCT. DECISION WAS TAKEN TO REMOVE THE ENGINE AND SEND IT FOR INVESTIGATION AND REPAIR. TROUBLESHOOTING IS NOW ON-GOING.