What was found
AT FL 39,000 FT, THE PILOT NOTICED SMOKE COMING INTO THE CABIN. THE PILOT DECLARED AN EMERGENCY AND STARTED DESCENT. DURING DESCENT PILOT NOTICED THAT THE LT ENGINE’S FUEL COMPUTER ENUNCIATOR LIGHT CAME "ON", THE PWR LEVER WAS RETARDED TO MAINTAIN PROPER EGT ON THAT LT ENGINE. COPILOT NOTICED THE LT ENGINE`S OIL PRESSURE ENUNCIATOR LIGHT CAME ON AND THEN NOTICED THE LT ENGINE`S OIL PRESSURE DROPPING VERY QUICKLY; AT THIS POINT THE PILOT PROCEEDED TO SHUTDOWN THAT LT ENGINE. SHORTLY AFTER ENGINE SHUTDOWN, THE LT ENGINE, THE SMOKE CEASED AND THE CABIN CLEARED. THE PILOTS COMPLETED EMERGENCY PROCEDURES AND KEPT DESCENDING AND GETTING VECTORED, THE AC FINALLY LANDED WITHOUT ANY INCIDENT. AFTER LANDING THE AC WAS TAXIED OFF THE RUNWAY AND SHUTDOWN ON THE TAXIWAY AS A PRECAUTION AND PASSENGERS WERE EVACUATED. (K)