What was found
C1 CHECK LEVEL 2 SURFACE CORROSION ON AFT LOWER CORNER SHAPE SILL ON LT PAX & CREW DOOR CUT OUT BETWEEN FRAME 66 TO FRAME 68, Z-500, Y 1584. REPLACED AFT LOWER CORNER SHAPE SILL BETWEEN FRAME 66 TO FRAME 68, Z-500, Y 1584 IAW SRM 51-72-11.