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 FORWARD LAV FLOOR SPLIT PLATE BRACKETS HAVE 4 SCREWS CORRODED. MAINTENANCE REMOVED AND REPLACED FOUR EACH SCREWS IN BRACKETS FOR FLOOR SPLIT JOINT PLATES IN FORWARD LAV IAW EMB 175 AMM 20-10-01. THE AIRCRAFT IS OUT OF SERVICE IN HEAVY CHECK.