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 5 EACH CRACKS WERE FOUND EMANATING FROM RIVET HOLES IN SKIN AT NR 5 SLAT ACTUATOR ATTACHMENT AREA. MAINTENANCE CUT OUT DAMAGED AREA OF NR 5 SLAT SKIN 42 INCHES TO 51 INCHES FROM INBOARD SIDE; FABRICATED A FILLER AND SPLICE PLATE; INSTALLED REPAIR PARTS IAW B737-300 SRM 57-43-01 FIG 206.