As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING HEAVY CHECK CORROSION FOUND ON EXTERIOR SURFACE OF LT FWD KEEL SKIN AT THE LT ECS CUT OUT. REMOVED CORROSION IAW SRM 51-21-58 AND FOUND TO BE OUT OF LIMITS. REPAIRED IAW STS ENGINEERING SOLUTIONS EA 12-2011-041. REPAIR PERFORMED UNDER W/O 17010.