What was found
DURING HEAVY MAINTENANCE: CORROSION FLOOR STRUCTURE BTW FR41 TO FR42 BTW Y1292 TO Y1732 EXTERNAL SKIN UPPER SURFACE CENTER WING BOX IN PASSENGER CABIN; (RESOLVED ON W/O: 1200126 TASKCARD: NR-00040 ) REF AEM NR2023-68841 FOR ALL WORK ACCOMPLISHED THE REPAIR OF CORROSION DAMAGE ON THE CENTER WING BOX UPPER SKIN PANEL UPPER SURFACE AT Y1292 AND BETWEEN STIFFENERS 16-17 IAW AEM EA# 57-0040-23, REV 0 (COVER AND PART#1-5) AND AIRBUS RDAF REF 81174227/003/2023#A AND EC# A23-220-01.