What was found
(CAN) DURING CLIMB OUT, THROUGH 1000 FEET, CREW STARTED TO GET SMOKE IN COCKPIT. THEY DECLARED AN EMERGENCY AND RETURNED TO LAND SAFELY. FIRE TRUCKS RESPONDED AND FLIGHT STOPPED ON THE RUNWAY FOR FIRE PERSONNEL TO INSPECT EXTERIOR OF ACFT FOR ANY SIGN OF FIRE. NO EVIDENCE OF FIRE. PASSENGER BUSSED TO TERMINAL AND ACFT WAS TOWED TO THE HANGAR FOR INSP. TRAX DEFECT 894816 OPEN. RUN UP C/OUT AND SMOKE CAME BACK, BOROSCOPE COMPLETED ON ENGINE AND FOUND OIL CONTAMINATION COMING FROM NR 2 ENGINE P3 PLENUN. NR 2 ENGINE REPLACED ALL LEAK CHECK AND RUN C/OUT AND BLEED AIR CHECK NO MORE SMOKE IN ACFT. DURING BOROSCOPE INSP ON NR 2 ENGINE, FOUND ONE BOLT MISSING, BOTH WERE FOUND LATER ON A DRAIN.