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-21 CHECK THE NR 1 LEADING EDGE SLAT WAS FOUND DELAMINATED AT THE INBOARD UPPER SURFACE WS 510 TO WS 512 LT. MAINTENANCE CUT OUT DELAMINATED AREA ON NR 1 L/E SLAT; FABRICATED A FILLER AND DOUBLER; INSTALLED REPAIR PARTS IAW B737-200 SRM 51-40-02, REPAIR 5, FIG 14.