As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING SCHEDULED INSPECTION FOUND SEVERAL SMALL SPOTS OF CORROSION ON BOTH LEFT AND RIGHT LOWER WING SKINS. PN OF THESE WING SKINS ARE: 67221463, 4 , 67221663,4 AND 67221723. SOME OF THESE AREAS EXCEEDED .007 INCH DEPTH. CONTACTED MFG ENGINEERING FOR REPAIR DISPOSITION. CAUSE OF CORROSION UNKNOWN.