As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF HAZE AND SMOKE WAS NOTICED IN THE COCKPIT. FLIGHT CREW DECLARED AN EMERGENCY AND RETURNED TO DEPARTURE AIRPORT. MAINTENANCE ISOLATED SOURCE OF SMOKE TO ENGINE NR 1 OIL LEAK OUT OF THE 2.5 BLEED. ENGINE NR 1 REPLACED AND PACK BURNOUT PERFORMED.