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 520 AND 540. CORROSION WAS DETERMINED TO BE OUT OF LIMITS. DAMAGED STRINGER WAS REMOVED FROM BS 500-540. FABRICATED 2 NEW STRINGERS 19 INCHES IN LENGTH FROM BAC1498-143 7075 T62. FABRICATED 2 NEW SPLICES FROM BAC 1498-132 DIM 16 INCH. INSTALLED REPAIR PARTS. NO OTHER DEFECTS WERE NOTED. AIRCRAFT WAS RETURNED TO SERVICE.