What was found
WHILE AIRCRAFT WAS IN HEAVY CHECK MAINTENANCE FOUND THE LEFT SHEAR WEB AT FRAME 87 TO 88 CORRODED. MAINTENANCE REMOVED AND REPLACED THE LEFT SHEAR WEB AT FRAME 87 TO 88 IAW EMB 175 SRM 51-42-03, 51-42-04, AND 51-43-03. THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK.