As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FINDING STEEL CYLINDERS ARE CRACKING FROM THE FUEL INJECTOR BOSS ACROSS TO THE SPARK PLUG BOSS ON A REGULAR BASIS. SUBMITTER REPORTS SOME CYLINDERS WITH AS LITTLE AS 600.0 TT CRACKED. SUBMITTER BELIEVES THERE MUST BE SOME TYPE OF MANUFACTURING PROBLEM.