As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCN - FLIGHT CONTROL - DURING C-18 CHECK, DELAMINATION WAS FOUND AT THE NR 4 SLAT WEDGE. DELAMINATION WAS FOUND ON TOP AND BOTTOM SURFACES. MAINTENANCE FOUND THAT THE DELAMINATION WAS BEYOND REPAIRABLE LIMITS. MAINTENANCE REMOVED AND REPLACED THE NR 4 SLAT ASSEMBLY IAW B737-300 AMM 27-81-21-4.