As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) SPARK PLUGS (6OFF) FAULTY - CENTRE ELECTRODE WAS BEYOND LIMITS FOR RECONDITIONING - NO1 CYLINDER TOP SPARK PLUG HAD TWO COPPERWASHERS FITTED - NO1 CYLINDER LOWER SPARK PLUG HAD CORE LEAKAGE -ENGINE HAD COMPLETED ONLY 38 HOURS SINCE OVERHAUL -PERSONNEL/MAINTENANCE ERROR