As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF 1ST OFFICER NOTICED SMOKE FROM VENT SLIT BEHIND REAR WINDOW. COCKPIT NOTICED SMOKE & ODOR RISING FROM SIDE WINDOW VENTS DURING T-O ROLL AND C-O. TURNED OFF LEFT PACK, SMOKE DISSIPATED. NO ODOR WAS DETECTED IN MAIN CABIN. MAINTENANCE VERIFIED NORMAL PACK OPERATION. SMOKE AND ODOR WAS PROBABLY DUE TO GAS PATH WASH PERFORMED ON THE ENGINE.