What was found
MCI - LEFT SKIN PANEL HAS CORROSION ON SURFACE OF PANEL AT LOWER AFT CORNER UNDER LAP SEAM AT STATION 434 LEFT STRINGER 37. AREA OF DISCREPANCY IS 1.75 INCHES BY 3.75 INCHES WITH A DEPTH OF APPROXIMATELY 50 PERCENT OF PANEL THICKNESS. TRIMMED DISCREPANT AREA OF SKIN PANEL TO REMOVE DAMAGE. INSTALLED EXTERNAL DOUBLER REPAIR AT LOCATION OF TRIM OUT PER MRB 767 2913 AND 2914.