What was found
DISCREPANCY: REFERENCE AIRBORNE /PEMCO N/R 13872.0698 AIRCRAFT WAS NOT GOUNDED AND IS IN CHECK FOR SCHEDULED MX. FD/CR PII ROW 137 RH AFT FUSELAGE CORROSION IN PREVIOUS DOUBLER REPAIR, AT OVERBOARD VENT VACUUM TOILET SYSTEM. CHECK FOR SERVICEABLILITY AND REPAIR AS REQUIRED. DOCUMENT ALL STRUCTURALEVALUATIONS/REPA CORRECTIVE ACTION: REMOVED CORRODED DOUBLER REPAIR & INSTALLED NEW ONE IAW A320 SRM 53-41-11-300-004. MX ACTION IS ACCEPTABLE/END/