As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON INSPECTION, NR 4 CYLINDER EXHAUST PIPE FLANGE DISTORTED AT LEFT TRANSITION. LEFT TURBOCHARGER HAD BECOME LOOSE AT ENGINE, SHIFTING DOWN SLIGHTLY CAUSING MISALIGNMENT WITH NR 4 PIPE. FORWARD TRANSITION SUPPORT BOLT (PN LW31-1.69) WAS MISSING. LYCOMING SB 512 PERTAINS TO THIS SUBJECT WHICH HAS RECENTLY BEEN REPLACED WITH SB 521.