As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE LEFT LOWER WING PLANK HAS CORROSION AT THE FUEL TANK ACCESS CUTOUT FOR PANEL 540AB HOLE NR 4 AT WS 54.861 APPROX .004 INCH DEEP BY 3 INCH LONG ON THE CRITICAL AREAS OF THE FORWARD AND AFT HOLE EDGES. MAINTENANCE REPAIRED FUEL TANK ACCESS HOLE CUTOUT WING PLANK IAW BOMBARDIER REO 601R-57-21-030 REV D. (M)