As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING RECOMMENDED INSPECTION OF WINGLET ATTACH HARDWARE FOR CORROSION, FOUND CORROSION IN THE WINGLET TO WING ATTACHMENT FITTING. IT APPEARS THIS CORROSION IS THE RESULT OF IMPROPER SEALING OF THE ATTACHMENT HARDWARE SINCE WATER WAS FOUND TRAPPED IN THE ONLY AREA OF CORRSION. THIS CORROSION WAS VERY DEEP AND WAS IN THE VOID BETWEEN THE UPPER AND LOWER BUSHINGS.