As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING ENGINE ROUTINE INSPECTION, WE NOTICED SOME DISCOLORATION ON THE EXHAUST WRAP WHEN COWLS WAS REMOVED (SB 20 78 04A). WHEN EXHAUST WRAP WAS REMOVED, IT REVEALED AN INSIDE BEND OF THE NR 1 CYLINDER AND FOUND THAT THE EXHAUST PIPE HAD BLOWN OUT. THIS WAS NOT OUR FIRST FINDING OVER THE PAST 3 MONTHS. WE HAVE HAD 3 OTHER AIRCRAFT WITH THE SAME IDENTICAL PROBLEM ON THE S3 ENGINES AT THE NR 1 CYLINDER ONLY. WE FEEL THIS PRESENTS A REAL CONCERN TO SAFETY.