As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - AFT CARGO DOOR EXTERIOR SKIN HAS CORROSION ON THE INSIDE OF THE DOOR SKIN WHICH EXCEEDS F28 SRM LIMITS. 1.5 INCH BY 1.5 INCH AREA 19 INCHES FROM BOTTOM OF DOOR, 5 INCHES AFT OF FORWARD EDGE. CORRSION NOTED DURING C-CHECK (NR 290-331). REPAIR DOUBLER INSTALLED I/A/W E.A. 28-52-121. AIRCRAFT RETURNED TO SERVICE.