What was found
***CORROSION*** FWD CARGO COMPARTMENT LH SIDE PLATE STA 500G+20.5 TO 500H+12 / CORROSION ON ZEE CHANNEL (SIDE PLATE) AT NUMEROUS LOCATIONS FWD CARGO L/H SIDE FROM STA 500B+15-500D MAXIMUM DEPTH MEASURES .020'. FOUND TO BE OUT OF LIIMITS. REMOVED CORRODED ZEE CHANNEL. LOCATED; DRILLED; DEBURRED; AND INSTALLED NEW ZEE CHANNEL AND REPAIR SPLICE FROM STA 500B+15-500D. REF; SRM 51-40-02; 51-40-05M 53-00-53-1A-2; AND 53-00-53-2R-5. 57575U 11/30/17 IAW BOEING DEG 143A7500