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 NUMBER 4 SPOILER ACTUATOR BOLT CORRODED. MAINTENANCE REMOVED AND REPLACED THE LEFT NUMBER 4 SPOILER ACTUATOR BOLT IAW EMB 170 AMM 27-62-01 AND 27-65-01. THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK.