What was found
CORROSION ON INTERCOSTAL OVER S26L BTW BS 865 - 913 AT INTERNAL FUSELAGE STRUCTURE. CORROSION ON INTERCOSTAL OVER S26L BTW BS 865 - 881 AT INTERNAL FUSELAGE STRUCTURE WAS REMOVED PER SRM 51-21-06-001-001-A01 AND EVALUATED ORIGINAL THICKNESS: 0.063 IN AND MINIMUM REMAINING THICKNESS IS 0.060 IN. THEREFORE IT'S WITHIN LIMITS IAW SRM 53-51-03-101-001-A02, INTERCOSTAL ON STGR 26L BTW FS= 881.00 TO FS897.00 WAS CLEANED PER CRJ 900 SRM 51-26-00-001-001-A01 AND NO CORROSION WAS FOUND AND INTERCOSTAL ON STGR 26L BTW FS= 897.00 TO FS=913.00 WAS EVALUATED OUT OFF LIMITS PER SRM 51-10-06-001-001-A01 AND REPLACE PER CRJ-900 SRM 51-42-21-001-001-A01 AND SRM 51-42-06-001-001-A01.