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 LAVATORY SERVICE DOOR HINGE CORRODED. MAINTENANCE REMOVED AND REPLACED THE HINGE ASSEMBLY ON THE AFT LAVATORY SERVICE DOOR IAW EMB 175SRM 51-41-02. THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK. PART NUMBERS HINGE 170-85089-401, HINGE 170-85090-003 AND HINGE PIN 170-87928-001.