As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX - C1 CHECK - RIGHT OUTBOARD FLAP NR 4 FLAP TRACK INBOARD SIDE LOWER SURFACE OF UPPER FLANGE. THERE IS PITTING CORROSION AT ROLLER CONTACT AREA. MAINTENANCE BLENDED OUT THE PITTING CORROSION, INSPECTED, REMAINED WITHIN LIMITS AND NO CRACKS NOTED.