As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING NRC:CA1528/152 , CORROSION WAS FOUND AT LH WING UPPER SURFACE , WBL79 , S-11 AREA. REMOVED CORROSION LEVEL 2 AT LH WING UPPER SURFACE WBL 83,S11 AREA FROM P/N 65C25204-15 ORIGINAL THICKNESS 0.160" REMOVES 0.028"AND REMAINING THICKNESS IS 0.132" IS OVER LIMITS PER B737-400 SRM 57-20-01 ALLOWABLE DAMAGE PERFORM REPAIR AS PER EO NO.737-57-0038(REV IR)REF BOEING 8100-9 REF ID 202403010089-02