What was found
MAIN CABIN FLOOR SUPPORT UPPER CHORD FLOORBOARD ATTACH FLANGE IS CRACKED IN MULTIPLE LOCATIONS BETWEEN STA 380 AND 400 AT APPROX LBL13. TRANSCRIBED FROM AAR GSO NRC 9288635 ESFR COMPLETE. REMOVED AND REPLACED INTERCOSTAL UPPER CHORD P/N 143A5410-4174 PO# 1137394.3 BETWEEN STA 380-400 LBL 13 IAW B737-800 SRM 51-40-02 AND BAC DWG 143A5400 REV: A REMOVED DOT PERFORMED BY AAR GSO V895440 INSP QC410 ALL MAINTENANCE COMPLETE AND ESFR COMPLIED WITH. REMOVED AND REPLACED INTERCOSTAL UPPER CHORD P/N 143A5410-4174 PO# 1137394.3 BETWEEN STA 380-400 LBL13 IAW B737-800 SRM 51-40-02 AND BAC DWG 143A5400 REV:A. AAR GSO MECH V895440 INSP QC410. APPROVED.