What was found
VERTICAL STAB AFT SPAR LT UPPER ANGLE HAS 2 AREAS OF VERIFIED INTERGRANULAR CORROSION. MECHANICALLY BLENDED CORROSION ON VERTICAL STAB AFT SPAR RT UPPER ANGLE, ABOVE RUDDER LOWER HINGE, IAW CESSNA 680 SRM 51-70-02. FOUND BLENDED AREA TO BE OUT OF LIMITS, PER CESSNA 680 SRM 51-70-02. SUBMITTED FINDINGS TO TEXTRON ENGINEERING. PERFORMED TEXTRON FIELD REPAIR FR-680-0230-8474 REV -. TITLED FIELD REPAIR-CORROSION, VERTICAL STABILIZER, RT REAR SPAR CAP, VFS 169 TO 171, DATED: 10/14/2020. SUPPORTED BY FAA FORM 8100-9.