As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE #1 CYLINDER INDUCTION VALVE FAILED IN FLIGHT. THE PROBLEM WAS NOT DETECTED UNTIL THE PILOT DID HIE POST FLIGHT WALK AROUND. THE VALVE BROKE IN HALF AT THE NARROW SPOT WERE THE VALVE KEEPERS ARE. THE VALVE PART NUMBER IS 17A23937, AND CONTROL NUMBER FOR THE VALVE IS 432408-32. AFTER THE VALVE FAILED IT FELL INTO THE CYLINDER CAUSING LOTS OF DAMAGE. THE INDUCTION SYSTEM WAS ALSO FILLED WITH OIL AND THE AIRCRAFT HAD LOST A SIGNIFICANT PORTION OF ITS OIL.