As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT WING LOWER WING PLANK ACCESS HOLE 550AB, WS 163.000 HAS FRETTING CORROSION AT OTBD END MEASURING APPROX 0.4" LONG X 0.08" WIDE X 0.002" DEEP. REPAIRED 550AB CUT OUT IAW GREO 601R-57-21-030 REV L DATED 02 05 14. THIS IS A MAJOR REPAIR. REF TO ATTACHED REO FOR WORK PERFORMED.