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 2 CRACKS, .5 AND .75 INCHES IN LENGTH, ON THE BOTTOM OF THE NR 4 SLAT INBOARD OF ACTUATOR FROM SS 50R TO SS 65R. MAINTENANCE TRIMMED OUT DAMAGED AREA ON THE NR 4 SLAT IAW BOEING 737-300 SRM 57-43-01-2R6. FABRICATED FILLER AND SPLICE PLATE IAW BOEING 737-300 SRM 57-43-01-2R6. INSTALLED FABRICATED REPAIR PARTS ON THE NR 4 SLAT FROM SS 50R TO SS 65R IAW BOEING 737-300 SRM 57-43-01-2R6.