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 COPPER PADS ON FWD AND AFT GUIDE RAMPS CORRODED R1 DOOR. MAINTENANCE REMOVED AND REPLACED THE COPPER GUIDE PADS ON THE R1 DOOR FWD AND AFT GUIDE RAMPS IAW EMB 175 AMM 53-10-25. THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK.