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 PACK RAM AIR VALVE PROFILE CRACKED. MAINTENANCE REMOVED AND REPLACED THE CRACKED PROFILE LEFT PACK RAM AIR VALVE IAW EMB 175 SRM 51-40-02, 51-41-01. THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK.