What was found
AVI DOOR INTERCOSTAL IS CORRODED BETWEEN STGR 27 TO STGR 26R. REMOVED FASTENERS FROM BRACKETS, SKIN, AND INTERCOSTAL STRING 27. REMOVED INTERCOSTAL STRING 27 FROM AVI DOOR INTERCOSTAL. IAW CRJ900 SRM 51-42-06-001-001-A01 AND 51-42-06-001-001-A01. MATCH DRILLED BRACKET AND SKIN TO THE NEW INTERCOSTAL STRING 27. INSTALLED NEW INTERCOSTAL STRING 27 WET TO BRACKETS AND SKIN AT AVI DOOR INTERCOSTAL USING NEW FASTENERS. APPLIED BEAD OF SEALANT AROUND THE INTERCOSTAL STRING 27. APPLIED PAINT TO FASTENERS AND SEALANT. APPLIED CORROSION PROHIBITOR TO FASTENERS AND INTERCOSTAL STRING 27. IAW CRJ900 SRM 51-40-11-001-001-A01, 51-42-06-001-001-A01, 51-42-21-001-001-A01, 51-23-00-001-001-A01, 51-25-06-001-001-A01, 51-25-16-001-001-A01, 51-21-11-001-001-A01