As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORDERED A NEW EXHAUST RISER FOR THE NR 2 CYLINDER. INSPECTING THE RISER BEFORE INSTALLATION WE FOUND A CRACK AT THE WELD RADIUS OF THE MOUNT FLANGE AND THE EXHAUST PIPE. THIS MAY HAVE ACCURED FROM EXCESS HEAT DURING MANUFACTUR. THIS THE FIRST CRACK SEEN ON NEW RISERS SEAT TO US, BUT WE HAVE HAD 2 IN SERVICE RISERS CRACKED AT 780.4 HOURS AND 2 IN SERVICE RISERS CRACKED. (K)