As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE FLIGHT PILOT EXPERIENCED SURGING M/P ON LT ENGINE AND VIBRATION ON FINAL. INSPECTION FOUND NR 2 CYLINDER INTAKE VALVE FRACTURED WITH PIECES IN NR 2 AND NR 3 COMBUSTION CHAMBERS. CYLINDER HEAD AND PISTON TOPS DAMAGED IN BOTH CYLINDERS FROM CONTACT WITH VALVE PIECES. (GL21200500265)