As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CRACK ON RAIL NUT PLATES INTERNAL CAVITY LEADING EDGE LOCATED OFSS569 AT RT WING. REPLACED RAIL NUT PLATES INTERNAL CAVITY LEADING EDGE LOCATED OFSS569 AT RT WING. IAW B737-700 SRM 51-10-02-0G-0 ITEM 9; SRM 51-40-02-0G-0 AND DWG 112A4402 SHEET: 14 REV: - MEASUREMENT OF CRACK IS: L= 0.379.