As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AIRCRAFT WAS IN FOR HEAVY CHECK, LEVEL 2 CORROSION WAS FOUND ON THE RT ENGINE PYLON PANEL 429DT HARDWARE. MAINTENANCE REMOVED AND REPLACED THE HARDWARE ON THE RT ENGINE PYLON PANEL 429DT IAW EMB 170/175 AMM 20-10-07. REF: P/N'S PE21114-3C8 BOLT & PE21114-3C6 BOLT.