What was found
THE LEFT LOWER WING PLANK HAS CORROSION AT THE FUEL TANK ACCESS CUTOUT FOR PANEL 540FB HOLE NR 8 WS 136.676 APPROX .005 INCH DEEP BY 1.25 INCH LONG IN THE CRITICAL AREA ON THE FORWARD EDGE AND APPROX .005 INCH BY .4 INCH IN THE CRITICAL AREA ON THE AFT HOLE EDGE. MAINTENANCE REPAIRED FUEL TANK ACCESS HOLE CUTOUT WING PLANK IAW BOMBARDIER REO 601R-57-21-030 REV D.