As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) NR 6 CYLINDER EXHAUST VALVE STEM BREAKING UP. STEM COULD BE MARKED EASILY INDICATING SOFT MATERIAL. VALVE STEM WAS FOUND TO BE WORN BY 0.1778 MM (0.007 INCH) IN THE VALVE GUIDE CONTACT AREA. THE ENGINE HAD BEEN FACTORY REMANUFACTURED 284 HOURS PREVIOUSLY. FOUND DURING INSPECTION WITH CONTINENTAL CRITICAL SERVICE BULLETIN 98.1 (CSB 98.1). PART TC: 284.