As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VISUAL INSPECTION OF RT WINGLET MOUNTING HOLES REVEALED CORROSION IN 3 EA OF THE VERTICAL ATTACH BORES FOR THE MOUNTING HARDWARE. CORROSION VERIFIED TO BE OUT OF LIMITS IAW MFG INSTRUCTIONS. WILL REQUIRE OVERSIZING OF BORES WITH APPROVED DATA.