What was found
DURING CLIMB, CABIN FILLED WITH SMOKE. COMPLIED WITH COM AND SMOKE STOPPED WHEN NR 2 PNEUMATIC SUPPLY AND NR 2 PACK SELECTED TO OFF. DIVERTED AIRCRAFT TO ORD FOR A PRECAUTIONARY LANDING. FOUND NR 3 ENGINE WITH NR 3 PACK ON CAUSING OIL FUMES IN THE CABIN AT 91 PERCENT N1 FAN SPEED. FOUND OIL IN THE NR 3 PACK COALESCER BAG. REMOVED AND REPLACED THE NR 3 PACK COALESCER BAG AND OPERATED ENGINES AT VARIOUS POWER SETTINGS WITH PACKS RUNNING. NO ODOR OR SMOKE NOTED.