As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - DURING C19 CHECK DISCOVERED 6 CRACK ON THE BOTTOM OF THE NR 1 SLAT SKIN, BELOW OUTBOARD AUX TRACK. MAINTENANCE REMOVED THE DAMAGED AREA ON THE BOTTOM OF THE NR 1 SLAT SKIN IAW BOEING 737-300 SRM 57-13-01-2R6. FABRICATED FILLER AND SPLICE PLATE IAW BOEING 737-300 SRM 57-13-01-2R6. INSTALLED FABRICATED REPAIR PARTS ON THE NR 1 SLAT SKIN IAW BOEING 737-300 SRM 57-13-01-2R6.