As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MAINTENANCE INSPECTION FOUND AIR CONDITIONING PACK SYSTEM, LEFT PACK OIL SMELL WITH PACK ON NO OIL SMELL WITH PACK OFF. THE AIRCRAFT WAS REMOVED FROM SERVICE. E1 CAUSES OIL SMELL IN COCKPIT. REMOVED AND REPLACED THE ENGINE IAW MTX WC 71-000-00. THE OPERATIONAL CHECKS AND LEAK CHECKS WERE GOOD. NO DEFECTS NOTED AT THIS TIME. THE AIRCRAFT WAS RETURNED TO SERVICE.