As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A ROUTINE INSPECTION, THE EXHAUST Y-COLLECTOR WAS FOUND WITH A ONE INCH CRACK. AN EXHAUST STAIN WAS PRESENT. RECOMMEND A THOROUGH INSPECTION OF THE EXHAUST SYSTEM EVERY 100 HOURS, ESPECIALLY ON LARGE TURBOCHARGED ENGINES. AD 75-23-08 R5 PERTAINS TO THIS SUBJECT.