As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - C1 CHECK - SUSPECT CORROSION AROUND 2 SKIN RIVETS X520 TO X522 BELOW SEAT TRACK NR 2. MAINTENANCE REMOVED RIVETS, BLENDED OUT CORROSION, INSPECTED, REMAINED WITHIN LIMITS AND NO CRACKS NOTED. INSTALLED RIVETS AND RESTORED FINISH TO REPAIR AREA.