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-15 CHECK 2 EACH CRACKS WERE FOUND EMANATING FROM STOP DRILL HOLES IN NR 4 SLAT LOWER OUTBOARD SKIN AT SS 116.75. MAINTENANCE CUT OUT CRACKED SLAT SKIN AT SS 116.75; FABRICATED A FILLER AND SPLICE PLATE; INSTALLED REPAIR PARTS IAW B737-300 SRM 57-43-01 FIG 206.