What was found
DURING HEAVY CHECK, GUSSET AT CENTER OF FRAME 11, FLIGHT DECK BENEATH FLOOR PANELS 221DLP, 221ELF IS CORRODED. MAINTENANCE R & R GUSSET AT CENTER OF FRAME 11 FLIGHT DECK BENEATH FLOOR PANELS 221DLP, 221ELF IAW SRM 51-23-04, 51-40-02, 51-41-02, PN 170-13808-001, GUSSET.