As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - C5 CHECK. SUSPECT CORROSION AROUND SHOP HEADS OF MULTIPLE RIVETS IN STRINGER 31 LT AT APPROX STATION X25.00. STRIPPED PAINT AND DRILLED OUT RIVETS. BLENDED CORROSION HFEC SHOWED NO CRACKS. C/W R/D 8/4 53-2789 SHEET 3 GENERAL NOTED 1-8.