As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING OTHER MX, THE NR 1 CYLINDER ON THE LT ENG WAS FOUND TO BE CRACKED IN THE INTAKE PORT, BETWEEN THE 14TH & 15TH COOLING FINS. THE TELLTALE SYMPTOM IS BLUE FUEL STAINING COMING FROM THAT AREA. THIS IS THE 6TH CYLINDER WE HAVE HAD CRACK IN THIS SAME AREA ON THIS PAIR OF ENGS WITH NO EXPLANATION FROM THE MFG OTHER THAN THAT THEIR WARRANTY INVESTIGATION IS ONGOING.