As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LOWER WING PLANK LANDING FOR ACCESS PANEL 550GB HAS MULTIPLE INDICATONS AROUND ENTIRE CIRCUMFERENCE APPROX .250" X 50 PERCENT FSH. FAILED NDT INSPECTION. PERFORMED REPAIRS TO LOWER WING PLANK LANDING FOR PNL 550GB IAW REO 601R-57-21-030, REV K AND COMPLIED WITH EC/TC EO 600-57-81. C/W IAW REO 601R-57-21-030, REV.K.