What was found
(AUS) RH ENGINE CONTAINED THREE CYLINDERS WITH INCORRECT BARREL/PISTON RING COMBINATION. LH ENGINE HAD ONE CYLINDER WITH INCORRECT RINGS. THE AFFECTED CYLINDERS WERE CHROMED CYLINDERS (CERMICROME) BUT DURING THE PREVIOUS ASSEMBLY WERE MISTAKEN FOR NITRIDED CYLINDERS AND FITTED WITH THE APPROPRIATE PISTON RINGS (CHROME) FOR THAT TYPE CYLINDER RESULTING IN CHROME RINGS IN A CHROME CYLINDER. PERSONNEL/MAINTENANCE ERROR