As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE WAS LEAKING OIL. INVESTIGATION REVEALED CRACKED MAG HOUSING AT LOWER HOLD DOWN FLANGE. GASKET SURFACE WAS CLEAN, CLAMP BLOCKS WERE PROPERLY POSITIONED AND TORQUED. CRACKED OUT SECTION REVEALED LARGE AREAS OF AIR POCKETS IN CASTING. SUSPECT CRACK STARTED FROM PRESSED IN IMPULSE PINS AGGREVATED BY INTERNAL WEAKNESS DUE TO FLAWED CASTING.