As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN HEAVY CHECK WAS REPORTED THAT WASTE SERVICE DOOR INNER SURFACE IS CORRODED. MX REMOVED AND REPLACED WASTE SERVICE DOOR ASSY. IAW EMB AMM 53-03-60, P/N 170-86668-403 PANEL ASSY. AIRCRAFT REMAINS AT CMH UNTIL HEAVY CHECK IS COMPLETED.