As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BTV-TYS - FLT 4201 - CREW REPORTED SMOKE IN COCKPIT AFTER TAKEOFF. AIR RETURNED TO BTV. TROUBLESHOT AND DETERMINED THAT OIL WAS LEAKY FAN SEAL. AIRCRAFT MAINTENANCE FERRIED TO TYS MAINTENANCE COMPLIED WITH ROLLS ROYCE SERVICE BULLETIN AND REPLACED TELFON LIP SEAL WITH NEW ONE. LEAKS AND OPS CHECK GOOD AIRCRAFT RETURNED TO SERVICE. (M)