As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - C4 CHECK - LIGHT SURFACE CORROSION FOUND ON TOP SURFACE OF AIRSTAIR TRACK APPROXIMATELY 6 INCHES FROM LEFT OUTBOARD SEAT TRACK NR 3 STATION X640 TO X643. BLENDED AWAY LIGHT CORROSION, INSPECTED, REMAINED WITHIN LIMITS AND NO CRACKS NOTED. APPLIED ALODINE AND PRIMER TO REPAIR AREA.