What was found
DISCREPANCY: REFERENCE PEMCO N/R# 12278N0220, AFT CABIN STRUCTURE, LEFT FUSELAGE HAS CORROSION RESIDUE TOP SURFACE AT FR66 WHERE PANELS 261LG, 261KF, 261MF INTERSECT. CORRECTIVE ACTION: REMOVED CORRODED FLOORBEAM. INSTALLED NEW FLOOR BEAM IAW A321 SRM 51-72-11-911-001./END/