As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER SWITCHING FROM APU TO ENGINE BLEED, SMOKE FILLED THE AFT CABIN . SMOKE AND ODOR DISSIPATED GRADUALLY PRIOR TO LANDING. FOUND LEFT AND RIGHT ENGINES TO BE OVER-SERVICED. REMOVED 1 QT OF OIL FROM EACH ENGINE. RAN ENGINES AND AIRCONDITIONING PACKS IAW 21-00-00. NO SMOKE NOTED AT THIS TIME.