As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE LT WING TDG OVERWING HEATER BLANKET NOFOD SYSTEM UPPER SKIN WAS FOUND WITH CORROSION REQUIRING BLENDOUT WITHIN A FEW INCHES OF THE PRIMARY BOOST PUMP ACCESS COVER. BLENDOUT RESULTED IN 3 SMALL HOLES THROUGH THE UPPER SKIN, EXPOSING THE PANEL CORE. THE DAMAGE WAS CLEANED UP, INSPECTED, AND REPAIRED PER THE APPLICABLE AMM 30-80-02-801 STEPS. THE PANEL IS THE SUBJECT OF AD 2002-21-06.