As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) LT ENGINE LOST OIL PRESSURE. INSPECTION FOUND NR 4 PISTON FAILED DUE TO DETONATION. FURTHER INVESTIGATION FOUND THE LT MAGNETO TIMING HAD MOVED FROM 20 DEGREES BTDC TO 35 DEGREES BTDC. MAGNETO GASKET HAD BEEN REPLACED AT PREVIOUS PERIODIC INSPECTION.