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, 5 PATCHES OF CORROSION WERE FOUND ON THE ON THE AFT SIDE OF THE RT WING REAR SPAR (BEAM WEB) BEHIND THE RAIN CURTAINS AT FASTENER LOCATIONS EXTENDING FROM RBS 359 TO 422. THE MEASURED CORROSION DEPTH RANGE WAS FROM .002 INCH TO .029 INCH AND ONE AREA MEASURING .058 INCH.