As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING TCM SB 96-12, CONTINUED AIRWORTHINESS INSTRUCTIONS FOR TCM CYLINDERS, BUBBLES WERE FOUND ACCUMULATING AROUND THE NR 2 CYLINDER UPPER SPARK PLUG HOLE. INSPECTION REVEALED A CRACK AT THE SPARK PLUG HOLE. THE CRACK ORIGINATED AT THE 3 O'CLOCK POSITION AND EXTENDED AFT TOWARD THE FUEL NOZZLE HOLE.