As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CAPTAIN OBSERVED SMOKE COMING FROM NR 1 ENGINE EXHAUST UPON SHUTDOWN AT THE GATE. FOUND NR 1 ENG OVERSERVICED WITH OIL. DE-SERVICED NR 1 AND NR 2 ENG OIL TO PROPER LEVELS, REF AMM TASK 12-10-71-210-802. GROUND RAN ENGINES AT VARIOUS POWER SETTINGS WITH BLEEDS ON. CLEANED LOWER COWLING OF RESIDUAL OIL. NO FURTHER DEFECTS NOTED.