What was found
INITIAL INSPECTION : CORROSION ON SILL ANGLES BTW STGR 15LH TO 16LH, FS720.85 TO 744.15 ALSO 15RH TO 16RH, FS720.85 TO FS744.15 BELOW LOWER SURROUND STRUCTURE EMERGENCY EXIT DOORS PAX CABIN ( CPAX ) ( TCI 53-20-334 ) SUMMARY: ON NRC. 00326 CORROSION LEVEL 1 ON SILL ANGLES BTW STGR 15LH TO 16LH , FS720.85 TO 744.15 ALSO 15RH TO 16RH , FS720.85 TO FS744.15 WERE REMOVED PER CRJ-900 SRM 51-21-06-001-001-A01 AND FOUND WITHIN LIMITS PER CRJ-900 SRM 53-00-00-101-001-A01.