As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AIRCRAFT WAS IN HEAVY CHECK MAINTENANCE FOUND THE LEFT HORIZONTAL STABILIZER HYDRAULIC LINE BLOCK ATTACH BOLT CORRODED. MAINTENANCE REMOVED AND REPLACED BOLT IAW EMB 170 AMM 20-10-00. THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK.