As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
*** WHILE AIRCRAFT WAS IN FOR HEAVY CHECK *** LEVEL 2 CORROSION WAS FOUND ON COPPER PADS ON BOTH FWD AND AFT GUIDE RAMPS ON AFT SERVICE DOOR. MAINTENANCE REMOVED AND REPLACED ALL 4 COPPER RAMP PADS ON THE AFT SERVICE DOOR IAW EMB 175 AMM 53-23-25. AIRCRAFT IS CURRENTLY STILL OUT OF SERVICE FOR HEAVY CHECK COMPLETION.