As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION ON RAIL NUT-PLATE LOCATED OFSS 491 INTERNAL CAVITY LEADING EDGE RT WING. REPLACED RAIL NUT-PLATE LOCATED OFSS 491 INTERNAL CAVITY LEADING EDGE AT RT WING AND APPLIED PROTECTIVE TREATMENT ON FASTENERS. IAW B737-800 SRM 51-40-02; SRM 51-10-02 ITEM 8; SRM 51-20-01 AND DWG 112A4402 SHEET 40 REV A.