What was found
DURING CRUISE FL 330, NOTICED OIL LEVEL WAS 7 QTS ON NR 1 ENGINE. NR 1 ENGINE ITT WENT INTO CAUTION SO THEY PULLED TL BACK HALFWAY. ITT CAME DOWN THEN SHOT INTO RED. NR 1 ENGINE SHUTDOWN ON ITS OWN AND THE COCKPIT FILLED WITH SMOKE. NO ENGINE FIRE INDICATION PRESENT. NO N2 ROTATION. DECLARED AN EMERGENCY, DIVERTED AND LANDED WITHOUT INCIDENT. WAS REMOVED FROM SERVICE. REMOVED AND REPLACED LEFT ENGINE. ALL LEAK CHECKS, FUNCTIONAL CHECKS AND OPS CHECKS COMPLIED WITH, NO DEFECTS NOTED IAW WC 71-00-00. AIRCRAFT RETURNED TO SERVICE.