As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 941 - LYH-LYH - DURING CLIMB, MADE AN UNSCHEDULED LANDING DUE TO SMOKE IN COCKPIT. AIRCRAFT RETURNED TO LYH WITH NO FURTHER INCIDENTS. MAINTENANCE INSPECTION AND FOUND OIL IN THE LEFT ACM WATER SEPARATOR SOCK. MAINTENANCE CLEANED SOCK. AIRCRAFT WAS RELEASED AND APPROVED FOR SERVICE. (M)