As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION FOUND ON BOTH WING REAR ATTACH FITTINGS. THIS PROBLEM IS ADDRESSED BY PIPER SB 977. IT APPEARS THERE IS SURFACE CORROSION ON THE STEEL FITTING AND DISSIMILAR METAL CORROSION ON THE SPAR CARRY-THROUGH STRUCTURE. SUBMITTER RECOMMENDED THIS SB BE MADE INTO AN AD TO ELIMINATE THIS UNSAFE CONDITION.