As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER REMOVAL OF AFT TOILET SERVICE PANEL CORROSION WAS FOUND ON INTERCOSTAL OF SERVICE PANEL. CORROSION LEVEL 2: INTERCOSTAL (PAN ASSY) OF AFT SERVICE TOILET PANEL WAS REPLACED PER SRM 51-40- 02-0G PAR 4.B. (1636269) AIRCRAFT WAS GROUNDED.