What was found
SUPPLEMENTAL INFORMATION: AFT CARGO; RIGHT HAND 'Z' CHANNEL HAS MULTIPLE AREAS OF CORROSION ON THE UPPER AND LOWER SURFACES / REMOVED MULTIPLE AREAS OF CORROSION ON AFT CARGO; RH 'Z' CHANNEL BETWEEN STA 727C-767 IAW SRM 51-10-02-0G-0 PGS 12-13; 15.A. EVALUATED MATERIAL LOSS AS .010' AT DEEPEST POINT PUTTING MATERIAL LOSS OUT OF LIMITS. REMOVED AND REPLACED 'Z' ANGLE FROM STATION 727C TO 767 IAW SRM 51-40-02-0G-0 AND DRAWING 146A 7500 FROM BOEING. INSPECTION TOOL: IN 17-0119 MATTAG: A71815