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, 3 CRACKS, .3' IN LENGTH EACH, FOUND ON BOTTOM NR 1 SLAT SKIN. MAINTENANCE REMOVED PREVIOUS REPAIR AND CRACKED SECTION ON NR 1 SLAT. FABRICATED FILLER AND SPLICE PLATE. INSTALLED FABRICATED REPAIR PARTS IAW BOEING 737-300 SRM 57-43-01-2 FIG 206.