As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT ENGINE BEGAN TO VIBRATE ON SHORT FINAL. FOUND BROKEN INNER AND OUTER EXHAUST VALVE SPRINGS AND BROKEN INTAKE VALVE INNER SPRING ON THE NR 5 CYLINDER. PULLED ROCKER BOX COVERS AND FOUND THE INNER INTAKE AND EXHAUST VALVE SPRINGS BROKEN ON 11 OF 12 CYLINDERS. CYLINDER, TISN71.2BCA, HAD ACCULATED 8.3 HRS SINCE NEW.