As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EWR FLT 4923 - MAINTENANCE REPORTED THE NR 2 ENGINE WAS BLOWING SMOKE INTO THE CABIN. MAINTENANCE REPLACED THE NR 2 ENGINE AND OPERATIONAL CHECKS WERE GOOD. THE TEAR DOWN REPORT FROM MANUFACTURER STATED THE NR 4 TEFLON LIP SEAL WAS THE PRIMARY FAILED ITEM ON THIS ENGINE. THE ENGINE WAS STRIPPED AND RESTORED TO A SERVICEABLE CONDITION.