As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE INTAKE TUBE P/N 646207 FOR THE NR 6 CYLINDER CRACKS OUT AT ITS CYLINDER FLANGE. THIS ENGINE HAS CRACKED 3 INTAKE TUBES. THE CRACKS HAVE BEEN FOUND FROM .5000 INCH LONG TO OVER 3 INCHES LONG. THIS CAUSES AN INTAKE FUEL LEAK AND FIRE HAZARD. THE INTAKE MANIFOLD DOES NOT HAVE ANY SUPPORT EXCEPT FOR THE INTAKE TUBES TO THE CYLINDERS. BELIEVE VIBRATION CAUSES THE CRACKS.