As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING MAINTENANCE WHILE ACCOMPLISHING A SCHEDULED 72 MONTH INSPECTION, 8 PATCHES OF CORROSION WERE FOUND ON THE ON THE AFT SIDE OF THE LT WING REAR SPAR (BEAM WEB) BEHIND THE RAIN CURTAINS AT FASTENER LOCATIONS EXTENDING FROM RBS 340 TO 406. THE LARGEST PATCH OF CORROSION WAS MEASURED AT 2 INCHES X 4.5 INCHES, WITH A DEPTH RANGE FROM .002 INCH TO .029 INCH AND ONE AT .058 IN.