What was found
DURING C-04 CHECK EXFOLIATION CORROSION WAS FOUND ON AFT CARGO DOOR SILL PLATE BETWEEN FR 52A AND FR 56. MAINTENANCE REMOVED AFT CARGO DOOR SILL PLATE FROM FR 52A TO FR 56; FABRICATED A NEW REPLACEMENT SILL PLATE IAW DWG D53230771; INSTALLED REPAIR PART IAW A320 SRM 51-42-11, FIG. 2-8, 12-13, AND 18.