What was found
WHILE AIRCRAFT WAS IN FOR HEAVY CHECK, LEVEL 2 CORROSION WAS FOUND ON THE LEFT & RIGHT GUSSETS AT FRAME 90. MAINTENANCE REMOVED AND REPLACED BOTH LEFT & RIGHT GUSSETS (SAME P/N'S 170-60257-001) AT FRAME 90 IAW EMB 190 SRM 51-41-02, 51-40-02, 51-40-04 & 51-21-01. AIRCRAFT IS CURRENTLY STILL OUT OF SERVICE FOR HEAVY CHECK COMPLETION.