As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) CYLINDER AND PISTON FITTED TO NO3 POSITION WERE INCORRECT PARTS -INCORRECT CYLINDER PNO 646680 HAD A SHORT REACH SPARK PLUG - CORRECT PNO 653444 CYLINDER HAS A LONG REACH SPARK PLUG AND PISTON PNO 648029 WITH STEEL INSERT - DIFFERENCE IN PISTON WEIGHTS WAS 315 GRAMS - PERSONNEL/MAINTENANCE ERROR - UNAPPROVED PART