What was found
WHILE A/C WAS IN FOR HEAVY CHECK FOUND LEVEL 2 CORROSION ON FR 87-88 LT WEB AROUND RIVET HEADS. MX REMOVED AND REPLACED LT SHEAR WEB FR 87-88 IAW EMB 175 SRM 51-40-02, 51-42-01, 51-43-01. P/N 170-65927-007. A/C REMAINS IN CMH FOR HEAVY CHECK COMPLETION.