As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - MAJOR REPAIR - DURING C-20 CHECK 6 CRACKS WERE FOUND ON NR 1 SLAT LOWER SKIN BELOW ACTUATOR AT WBL 445. MAINTENANCE CUT OUT DAMAGED SKIN ON NR 1 SLAT LOWER SKIN WBL 445; FABRICATED A FILLER AND SPLICE PLATE; INSTALLED REPAIR PARTS IAW 57-43-01 FIG 206 PG 216-219.