What was found
DURING HEAVY CHECK, FWD CARGO LOWER DOOR SILL HAS 5 NUTPLATES STAND OFF BRACKETS CORRODED WITH 1 CRACKED, 1 DENTED. MAINTENANCE R & R FWD CARGO LOWER SILL HAS 5 NUTPLATES STAND OFF BRACKETS CORRODED WITH 1 CRACKED, 1 DENTED IAW EMB 170 51-40-02, PN 170-67176-401, SUPPORT. AIRCRAFT REMAINS UNTIL HEAVY HECK IS COMPLETED.