What was found
DURING M-CHECK FOUND FT AFT CABIN 4L DOOR SILL HAS CORROSION BS 1640-1681 LBL54" TOP SURFACE & LWR SURFACE AT BS 1640. CLEANED OUT CORRODED AREA IAW SRM 51-10-02, DIMENSIONS L=2.6 W=2.0 D=.0205 IAW SRM 53-60-15 OUT OF LIMITS, REMOVED DOOR SILL IAW SRM 51-40-02. LOCATED AND DRILLED IAW SRM 51-40-05, INSTALLED P/NDA-146N5246-7-12 AND DA-146N5246-5-12 IAW SRM 51-40-02. INSTALLED 2EA L-4 DOOR SILL SUPPORT IAW SRM 51-40-02, PAINTED AREA IAW AMM 51-21-00.