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 FOUND THE UPPER AND LOWER SURFACE OF NR 4 SLAT WEDGE DELAMINATED AT SS 59 RT. MAINTENANCE CUTOUT DAMAGE IN NR 4 SLAT WEDGE FROM SS 57 TO SS 61 RT; FABRICATED A CORE FILLER AND DOUBLER; BONDED REPAIR PARTS TO SLAT IAW B737-300 SRM 51-70-10, FIG 22.