As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HAVE HAD TWO CYLINDER CRACK IN THE SAME PLACE WITH IN A TWO MONTH PERIOD. REQUESTING THAT AL FOUR CYLINDERS ARE REPLACED. ALSO HAD ONE CRACK ON A SECOND AIRCRAFT BOTH ENGINES WERE REBUILT AT THE SAME TIME JAN 2020 TWO DIFFERENT PLACES THIS ENGINE HAD NEW LYCOMING CYLINDERS AND THE SECOND HAD SUPERIOR CYLINDERS.