What was found
CORROSION AT FS310 TO FS349 & L/H STRINGER 21LH (C-CHECK RO 3/10/2022) REMOVED AND REPLACED CORRODED BACK UP SILL AT FS 310.00 TO FS 349.00 STGR 21L WITH NEW BACK UP SILL. REF. CRJ700 SRM 51-40-11-001-001-A01, SRM 51-42-06-001-001-A01, SRM 51-42-21-001-001-A01, 51-25-06-001-001-A01AND SRM 51-25-16-001-001-A01. REFERENCE CONTINUATION CARD FOR REPAIR DISPOSITION AND CORRCTIVE ACTIONS. NO FURTHER ACTION REQUIRED AT THIS TIME.