What was found
DURING C-4 CHECK INSPECTION, FOUND LEFT VERTICAL STABILIZER REAR SPAR CORRODED AT STA ZR180. REPAIRED IAW SKETCH AIA/E/2386 TREATED AND PRIMED IAW DC-8 SRM 51-1-8. REPAIR ACCOMPLISHED IAW EA 96-326 AND AIA 8110-3 DATED 11-15-96. CORROSION CARD NR 6000-0551, NON-ROUTINE TASK CARD NR 88461.