As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENVIRONMENTAL SMOKE NOTICED FROM FRONT WEMAC VENTS. MORE PRONOUNCED IN HP MODE AND DURING POWER REDUCTION. CHECKLIST WAS USED AND IT WOULD SEEM TO BE ISOLATED TO THE LEFT PRESSURE SOURCE. DETERMINED SMOKE TO BE FROM RT ENGINE. REPLACED RT ENGINE OIL PUMP DUE TO INTERNAL LEAKAGE. COMPLETED SATISFACTORY GROUND RUNS AND LEAK CHECKS IAW MM 79-20-05.