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 AFT DRAIN SHROUD BONDING STRAPS. MAINTENANCE REPAIRED THE AFT DRAIN SHROUD BONDING STRAPS IAW EMB 170 SRM 51-73-00. AIRCRAFT IS CURRENTLY STILL OUT OF SERVICE FOR HEAVY CHECK COMPLETION.