As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - DURING C16 CHECK DISCOVERED 4 CRACKS, .500 INCHES EACH, ON THE BOTTOM OF THE NR 4 SLAT SKIN, FROM SS 57R TO SS 61R. MAINTENANCE CUT OUT DAMAGED SKIN IAW BOEING 737-300 SRM 57-43-01-2R6 FIG 201. FABRICATED FILLER AND SPLICE PLATE IAW BOEING 737-300 SRM 57-43-01-2R6 FIG 201. INSTALLED FABRICATED REPAIR PARTS ON THE NR 4 SLAT SKIN FROM SS 57R TO SS 61R IAW BOEING 737-300 SRM 57-43-01-2R6 FIG 201.