As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 3306 - SBP-LAX - PILOT REPORTED, THAT WHILE IN FLIGHT A BURNT OIL SMELL WAS DETECTED COMING FROM THE LEFT BLEED AIRFLOW. MAINTENANCE PERSONNEL INSPECTED THE SYSTEM AND DETERMINED THAT THE LEFT ACM HAD BEEN OVERSERVICED. THE UNIT WAS DESERVICED, OPERATIONAL CHECKS WERE SATISFACTORY AND THE AIRCRAFT WAS RELEASED BACK TO SERVICE.