As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB AFTER TAKEOFF, THE CREW REPORTED SMOKE ENTERING THE CABIN FROM A PNEUMATIC SOURCE. THE FLIGHT RETURNED TO LAX AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED THE AIRCRAFT AND DETERMINED THE NR 1 ENGINE TO BE LEAKING OIL AND CONTAMINATING THE NR 1 PNEUMATIC SYSTEM. THE AIRCRAFT WAS FERRIED TO MSP TO REPLACE THE NR 1 ENGINE.