As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN HEAVY MAINTENANCE IT WAS NOTED THAT STR 28L HAS CORROSION AT BS 540 AND 560. CORROSION WAS DETERMINED TO BE OUT OF LIMITS. DAMAGED STRINGER WAS REMOVED FROM BS 540-560. FABRICATED NEW STRINGERS 19 INCH IN LENGTH FROM BAC1498-143 7075 T62. FABRICATED NEW SPLICE FROM BAC1498-132 DIM 12 INCHES. INSTALLED REPAIR PARTS. NO OTHER DEFECTS WERE NOTED. AIRCRAFT WAS RETURNED TO SERVICE.