As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: CORROSION OF DOUBLER NEAR AFT LAVATORY VENT OUTLET FOUND DURING WALKAROUND INSPECTION BETWEEN FR69 AND FR70 AND BETWEEN STR 30R AND STR 33R. REPLACED INTERNAL FLANGE DOUBLER WITH NEW IAW SRM 51-42-11 AND 51-72-11 AND DRAWING D53480192.