As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - C1 CHECK - CORROSION UNDER AFT CARGO DOOR THRESHOLD SUPPORT ANGLE APPROXIMATELY STA X600 STRINGER 28L. MAINTENANCE REMOVED RIVETS BLENDED CORROSION, INSPECTED, BLENDED AREA REMAINED WITHIN LIMITS WITH NO CRACKS NOTED. INSTALLED RIVETS AND RESTORED FINISH TO REPAIR AREA.