As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE BS 1342, LT INBD FRAME CHORD WAS FOUND SEVERELY RUSTED DURING A RE-ENGINING MODIFICATION. THIS CONDITION HAS BEEN FOUND ON ALL 38 A/C MODIFIED SO FAR. THIS CONDITION IS PROBABLY CAUSED BY DISSIMILAR METALS AND A LACK OF DRAINAGE. NOTE: THE RUST CANNOT BE SEEN WITHOUT REMOVING THE PART, SO IT MAY NEED X-RAY INSPECTION EVERY S0 MANY YEARS.