As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON DISASSEMBLY OF ENGINE, FOUND WRONG PISTONS INSTALLED. RECORDS INDICATE PISTONS SOLD AS PART OF A TOP OVERHAUL KIT WITH CHROME CYLINDERS (4/1994). CYLINDERS REMOVED FOR GLAZING AND 3 PISTONS WERE SCORED ENOUGH TO REQUIRE REPLACEMENT. REPLACED ALL 6 WITH CORRECT SET OF BALANCED PISTONS.