As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - FUSELAGE SKIN ON INSIDE OF CUTOUT FOR APU EXHAUST HAS PAINT DETERIORATION WITH LIGHT SURFACE CORROSION AROUND NUT PLATES. THERE ARE ALSO SEVERAL NUT PLATES WITH CORROSION. REPLACED NUT PLATES AND REPAIRED IAW HORIZON AIR EA 4-53-1082.