As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YVR - MAJOR REPAIR - DURING C-16 CHECK THE #4 SLAT WAS FOUND DELAMINATED AT THE INBOARD UPPER TRAILING EDGE SURFACE. MAINTENANCE REMOVED THE #4 SLAT AND REPAIRED DAMAGE IAW B737-300 SRM 51-70-10 REPAIR 22 & 23. REINSTALLED #4 SLAT IAW BMM 27-81-21, PG. 401-419.