As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED DURING RUN-UP, RT ENGINE RPM OSCILLATES 100 RPM. MAINTENANCE INSPECTED AND FOUND THE NR 3 CYLINDER EXHAUST LIFTER PITTED, THE NR 3 INTAKE LIFTER COLLAPSED AND THE NR 5 CYLINDER INTAKE LIFTER COLLAPSED. MAINTENANCE R & R THE LIFTERS IAW O/H MANUAL CH 72-20-18.