What was found
DURING AN INSPECTION REQUIRED BY TCM CSB98-1B, TITLED INTAKE AND EXHAUST VALVE INSPECTION, THE INTAKE VALVE TIPS ON THE NR'S 2, 4, AND 6 CYLINDERS WERE FOUND EXCESSIVELY WORN. SUBMITTER SUGGESTED POSSIBLE CAUSE AS DEFECTIVE PARTS INSTALLED INTO THE ENGINE AT REMANUFACTURE.