What was found
CORROSION OUT OF LIMITS IN REF NRC 00459: UT) MEASUREMENT THICKNESS WAS ACOMPLISHED ON ANGLE FLOOR SUPPORT STA 976 TO 1040 STGR 17L OF AREA ABOVE WING CENTER SECTION ORIGINAL THICKNESS 0.070IN AND MINIMUM REMAINING THICKNESS IS 0.033IN THEREFORE IT IS OUT OF LIMITS PER B757-300 SRM 53-40-13-1A PROCEDURE 1, DETAIL VII. CORROSION LEVEL 2: ANGLE FLOOR SUPPORT STA 976 TO 1040 STGR 17L OF AREA ABOVE WING CENTER WAS REPLACED PER B757-300 SRM 51-40-02-0G (1636264) AIRCRAFT WAS GROUNDED