Depends on why it's warped. Is the aluminum spar that holds them together bent, or are we talking the wing itself? If its the wing itself, not a lot you can do but to try and either rebuild it, or I've heard of others saying to get the wood hot and try to bend it (hot with heat iron, or even with steam). Others may chime in with better input than I. Of course if it's the aluminum spar that connects the wings together, that's an easy fix