What was found
THE LEFT LOWER WING PLANK HAS CORROSION AT THE FUEL TANK ACCESS CUTOUT FOR PANEL 550DB HOLE NR 12 AT WS 230.415 APPROX .004 INCH DEEP BY 1.25 INCH LONG IN THE CRITICAL AREA ON THE FORWARD HOLE EDGE AND APPROX .004 INCH DEEP BY .75 INCH LONG IN THE CRITICAL AREA OF THE AFT EDGE. MAINTENANCE REPAIRED FUEL TANK ACCESS HOLE CUTOUT WING PLANK IAW BOMBARDIER REO 601R-57-21-030 REV D. (M)