As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED SMOKE LAV CAS MESSAGE ON TAXI IN, ACCOMPANIED BY STRONG SMELL OF SMOKE. CREW STOPPED AIRCRAFT SHORT OF JETBRIDGE AND PASSENGERS EVACUATED AIRCRAFT THROUGH PASSENGER DOOR. MAINTENANCE INSPECTED LAVATORY AND FOUND NO EVIDENCE OF FIRE OR SMOKE. MAINTENANCE NOTED OIL SMELL WHEN BLEED SELECTED TO APU. MAINTENANCE REMOVED AND REPLACED APU AND PERFORMED CHECKS USING AIRCRAFT MAINTENANCE MANUALS. AIRCRAFT RELEASED FOR SERVICE.