As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) NO4 AND NO5 CONNECTING RODS BOTH HAD ONE MISSING SPLIT PIN. PIECES OF SPLIT PIN FOUND IN OIL SYSTEM AND UNDER OIL PRESSURE RELIEF VALVE. INVESTIGATION AND MEASUREMENTS FOUND THAT UNDER CERTAIN CIRCUMSTANCES THE SPLIT PIN CAN CONTACT THE CYLINDER SKIRT.