As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING PERFORM TASK CARD WA5729, FOUND LEFT WING REAR SPAR UPPER CAP P/N ARB7413-1 CORROSION ST XW899 NRC. RE-IDENTIFY THE CORROSION AREA IS AT XORS 1052 AND PFM EI: W2010A57B-383 REV00 REPAIR CORROSION ON LT WING REAR SPAR UPPER CAP UPPER SURFACE AT XORS 1052. COND CHECK NORMAL.