As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE: LEFT WING FIX LEADING EDGE OUTBOARD OF NAC STRUT PANEL 521KB HAS FIBERGLASS EXPOSURE THROUGHOUT PANEL. ACCOMPLISHED PERMANENT SURFACE FINISH REPAIR AT LEFT WING LEADING EDGE PANEL 521KB. PER DMC AMM B787-A-51-21-13-01A-257A-A.