As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER STARTING NR 4 ENGINE, FLIGHT ATTENDANT REPORTED SMOKE IN CABIN. FURTHER EVALUATION NEEDED ON THE ENGINE. MAINTENANCE FOUND NR 3 BEARING TUBE CLOGGED. RETRIEVED CARBON DEPOSIT ON NR 3 COMPARTMENT. REMOVED AND REPLACED EVC AS PER TC 75-361. RAN ENGINE PER MM 71-00-00 TEST 8, OPS CHECKED NORMAL. A/C RETURN TO LEASE COMPANY. (M)