What was found
DURING HEAVY CHECK, LT WING 3 FUEL TUBES CLAMPS INSIDE PANEL 521AB HAVE CORROSION. MX R & R LT WING 3 FUEL TUBES CLAMPS INSIDE PANEL 521AB IAW AMM 20-10-13, R & R CONNECTING FUEL TUBES, PN 170-08807-401, 170-08806-403, 170-06026-401 IAW AMM 20-10-03.