What was found
VERTICAL STAB AFT SPAR LT UPPER ANGLE HAS 2 AREAS OF VERIFIED INTERGRANULAR CORROSION. MECHANICALLY BLENDED 2 AREAS ON VERTICAL STAB AFT SPAR LT UPPER ANGLE, IAW CESSNA 680 SRM 51-70-02. EVALUATED AREA AND FOUND TO BE OUT OF SRM LIMITS. PERFORMED TEXTRON FIELD REPAIR-CORROSION, VERTICAL STABILIZER, LT REAR SPAR CAP, VFS 190 AND 220 FR-680-0220-8415 REV- DATED: 09/30/2020, APPROVED ON FAA FORM 8100-9 DATED 09/30/2020.