What was found
IAD/ROC - FLT 6423 - DURING CLIMB-OUT AT 1940 HRS ON 12-20-95, AN EMERGENCY WAS DECLARED AND AIRCRAFT RETURNED TO IAD DUE TO THERE BEING SMOKE IN THE CABIN. AIRCRAFT LANDED AT IAD WITH NO FURTHER INCIDENTS. MAINTENANCE DRAINED A SMALL AMOUNT OF OIL FROM THE LT COLD AIR UNIT. PERFORMED MAINTENANCE RUNS, BUT COULD NOT DUPLICATE DISCREPANCIES. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (X)