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 FIRE EXTINGUISHER LINE RIGHT E2 PYLON CORRODED. MAINTENANCE REMOVED AND REPLACED THE E2 PYLON FIRE EXTINGUISHER LINE IAW EMB 175 AMM 20-10-13. THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK.