What was found
DURING HEAVY CHECK, LT WING 4 FUEL TUBES CLAMPS INSIDE PANEL 521BB HAVE CORROSION. MX R & R LT WING 4 FUEL TUBES CLAMPS INSIDE PANEL 521BB IAW AMM 20-10-13, R & R CONNECTING FUEL TUBES, PN 170-06027-401, 170-06024-401, 170-06025-401 IAW AMM 20-10-03. PN 170-06027-401, TUBE.