What was found
WHILE A/C WAS IN FOR HEAVY CHECK FOUND 3 GUSSETS ON FLOORBEAM AT FR90 HAS POSSIBLE CORROSION. MX REMOVED AND REPLACED 2 GUSSETS AT FR90 IAW EMB 190 SRM 51-40-02, 51-41-02, 51-21-00 AND 1 GUSSET AT FR 90 WAS FOUND TO BE FREE OF CORROSION BELOW TOP COAT. P/N 'S 170-60257-001, AND 170-60259-001. A/C REMAINS IN CMH FOR HEAVY CHECK COMPLETION.