What was found
DURING HEAVY MAINTENANCE: CORROSION STRINGER 43L LOC, BTW FR. 56 TO FR. 57 ON FLOOR SURFACE IN AFT CARGO COMPARTMENT REMOVED AND REPLACED STRINGER LOC.BTW FR54 TO FR60 STRG 43L ON AFT CARGO COMPARTMENT I.A.W A320 SRM 51-42-11, A320 SRM 51-72-11 AND DWG E53470342,