What was found
ON TOP OF DESCENT, COCKPIT FILLED WITH SMOKE OF UNKNOWN ORIGIN, CK LISTS WERE RUN BUT SOURCE OF SMOKE COULD NOT BE DETERMINED. PERFORMED OPER CK OF ELEC EQUIP, FOUND NORMAL, NO EVIDENCE OF FIRE OR OVERHEATING , PERFORMED OPER CK OF NR 1 AND NR 2 PACKS, FOUND NR 1 PACK HAS HEAVY OIL SMELL. REMOVED AND CLEANED COALESOR BAG, COLLECT OR CHAMBER, AND HOUSING OF WATER SEPERATOR, PURGED NR 1 PACK, PERFORMED OPER CK OF NR 1 PACK, OPER NORMAL, NO SMOKE OR SMELL OF SMOKE.