As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON PREPPING WINGS FOR RE-COVER, EXFOLIATION DISCOVERED IN STBD WING MAIN SPAR CAP UPPER. SEVERAL LAYERS OF VARIOUS TYPES OF TAPE HID THE CORROSION UNTIL REMOVED FOR INSPECTION. EXFOLIATION RUNS FULL LENGTH OF SPAR CAP, VARYING IN DEPTH TO .0625 INCH.