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-19 CHECK, 4 CRACKS EACH .3 INCH IN LENGTH FOUND ON BOTTOM OF NR 2 SLAT SKIN BELOW OUTBOARD MAIN TRACK AT SLAT STATION 228 TO SLAT STATION 232. MAINTENANCE CUT OUT AND REMOVED CRACKED SECTION OF NR 2 SLAT SKIN. FABRICATED FILLER AND SPLICE PLATE. INSTALLED FABRICATED REPAIR PARTS IAW BOEING 737-300 SRM 51-40-02-0 FIG 8.