As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT WING, LOWER WING PLANK ACCESS HOLE CUTOUT AT 640BB HAS PITTING CORROSION AROUND THE INBOARD AND OUTBOARD RADIUS LOCATIONS. C-CHECK RO 11/11/2020. REPAIR TO 640BB CUTOUT WAS PERFORMED, IAW REO. NO CHANGE TO WEIGHT AND BALANCE, M-337 AND TASK CARD ATTACHED. ORIGINAL THICKNESS MEASURED 0.191" REMAINING THICKNESS 0.181".