As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TYS A/C HAD SMOKE ON CLIMBOUT AND THEN CLEARED. THEN ANOTHER TIME ON LEVELING OFF, AGAIN LEFT. A/C WAS CHECKED OUT AND FERRIED TO TYS. MAINTENANCE REMOVED AND REPLACED THE NR 1 ENGINE IAW RR TASKCARD 627100. OPS AND LEAK CHECKS WERE GOOD, RELEASED BACK TO SERVICE. [07-24-07] THE CAUSE OF THE SMOKE WAS A LEAKING NR 4 CARBON SEAL.