As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PERFORMING CASA COM LETTER 212-224 AND CASA SB 212-57-57-30, A CRACK WAS NOTED FROM THE 4TH RIVET TO THE 5TH RIVET FROM THE BOTTOM, ON THE VERTICAL STIFFINER LOCATED ON THE LT WING AT STA 4700, AFT SPAR WEB. THREE STIFFINERS NEXT TO THE ORIGINAL ARE CRACKED EXACTLY THE SAME, CRACKS ARE LOCATED INT HE SAME POSITIONS, BETWEEN THE 4TH AND 5TH RIVIT FROM THE BOTTOM. THIS TOTALS 4EA CRACKED STIFFINERS.