As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE STARTED EXTREME VIBRATION CLIMBING THROUGH 13,000 FEET. OIL LEAK OBSERVED COMING FROM LOUVERS. ENGINE WAS SHUT DOWN AND PROPELLER FEATHERED. INSPECTION REVEALED 2 HOLES IN CASE HALVES ABOVE NR 1 AND NR 2 CYLINDERS. NR 1 CYLINDER ROD BROKEN. SEVERAL INTERNAL PIECES LAYING IN BAFFELING. RT MAGNETO DESTROYED DUE TO FOREIGN OBJECT IMPACT.